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PM 40-MG

Original operating instructions

Information about the operating instructions

About these operating instructions

  • Read these operating instructions before the product is used or operated for the first time. This is a prerequisite for safe, trouble-free handling and use of the product.
  • Observe the safety instructions and warnings in these operating instructions and on the product.
  • Always keep the operating instructions with the product and make sure that the product is accompanied by these operating instructions only, when the product is given to other persons.

Explanation of symbols


Warnings alert persons to hazards that occur when handling or using the product. The following signal words are used:
  • Draws attention to imminent danger that will lead to serious personal injury or fatality.
  • Draws attention to a potential threat of danger that can lead to serious injury or fatality.
  • Draws attention to a potentially dangerous situation that could lead to personal injury or damage to the equipment or other property.

Symbols in the operating instructions

The following symbols are used in these operating instructions:
Image alternative Comply with the operating instructions
Image alternative Instructions for use and other useful information
Image alternative Dealing with recyclable materials
Image alternative Do not dispose of electric equipment and batteries as household waste

Symbols in illustrations

The following symbols are used in illustrations:
Image alternative These numbers refer to the illustrations at the beginning of these operating instructions.
Image alternative The numbers in illustrations refer to important work steps or to components important for the work steps. In the text, the corresponding numbers draw attention to these work steps or components, e.g. (3) .
Image alternative Item reference numbers are used in the overview illustration and refer to the numbers used in the key in the product overview section.
Image alternative This symbol is intended to draw your special attention to certain points for handling the product.

Sticker on the product

Laser information
Image alternative Laser class 2 based on standard IEC60825-1 / EN60825-1:2007 and compliant with CFR 21 § 1040 (Laser Notice 50).
Do not look straight into the laser beam.

Product information

Hilti products are designed for professional use and may be operated, serviced and maintained only by trained, authorized personnel. This personnel must be specifically informed about the possible hazards. The product and its ancillary equipment can present hazards if used incorrectly by untrained personnel or if used not in accordance with the intended use.
The type designation and serial number are printed on the rating plate.
  • Write down the serial number in the table below. You will be required to state the product details when contacting Hilti Service or your local Hilti organization to inquire about the product.
    Product information
    Multi-line laser
    PM 40-MG
    Serial no.

Declaration of conformity

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We declare, on our sole responsibility, that the product described here complies with the applicable directives and standards. A copy of the declaration of conformity can be found at the end of this documentation.
The technical documentation is filed and stored here:
Hilti Entwicklungsgesellschaft mbH | Tool Certification | Hiltistraße 6 | 86916 Kaufering, DE


Safety instructions

In addition to the warnings given in the various sections of these operating instructions, the following points must be strictly observed at all times. The product and its ancillary equipment may present hazards when used incorrectly by untrained personnel or when used not as directed.
  • Keep all safety instructions and information for future reference.
  • Check the accuracy of the tool before use and several times during use.
  • Stay alert, watch what you are doing and use common sense when operating the tool. Do not use the tool while you are tired or under the influence of drugs, alcohol or medication. A moment of inattention while operating the tool may result in serious personal injury.
  • Tampering with or modification of the tool is not permitted.
  • Do not render safety devices ineffective and do not remove information and warning notices.
  • Keep children and other persons away from the area while the tool or appliance is in use.
  • Take the influences of the surrounding area into account. Do not use the tool where there is a risk of fire or explosion.
  • The laser plane should be well above or well below eye height.
  • You must check the accuracy of the device after it has been dropped or subjected to other mechanical stresses.
  • To achieve maximum accuracy, project the line onto a vertical, flat surface. When doing so, set up the tool at 90° to the surface.
  • Keep the laser exit aperture clean to avoid measurement errors.
  • Observe the information printed in the operating instructions concerning operation, care and maintenance.
  • When not in use, tools must be stored in a dry, high place or locked away out of reach of children.
  • Observe the national health and safety requirements.

Proper preparation of the working area

  • Avoid awkward body positions when working from ladders. Make sure you work from a safe stance and stay in balance at all times.
  • Secure the site in which you are taking measurements and take care to avoid directing the beam towards other persons or towards yourself when setting up the tool.
  • Measurements taken through panes of glass or other objects may be inaccurate.
  • Ensure that the tool is set up on a stable, level surface (not subject to vibration).
  • Use the tool only within its specified limits.
  • If several laser tools are used in the same working area, care must be taken to avoid confusing the beams.
  • Strong magnetic fields may affect the accuracy of the tool. Magnetic objects should thus be kept away from the measuring tool. Hilti magnetic adapters may be used.
  • When the tool is brought into a warm environment from very cold conditions, or vice-versa, allow it to become acclimatized before use.

Electromagnetic compatibility

Although the device complies with the strict requirements of the applicable directives, Hilti cannot entirely rule out the possibility of interference to the device caused by powerful electromagnetic radiation, possibly leading to incorrect operation. Check the accuracy of the device by taking measurements by other means when working under such conditions, or if you are unsure. Likewise, Hilti cannot rule out the possibility of interference with other devices (e.g. aircraft navigation equipment).

Laser classification for laser class 2/class II tools

The tool complies with laser Class 2 as per IEC 60825-1:2007 / EN 60825-1:2008 and Class II as per CFR 21 § 1040 (FDA). These devices can be used without further protective measures. Nevertheless, as with the sun, do not look directly into the light source. If you do inadvertently look into the laser beam, immediately close your eyes and move your head clear of the laser beam. Do not aim the laser beam at persons.

Careful handling and use of batteries

  • Observe the special guidelines applicable to the transport, storage and use of lithium-ion batteries.
  • Do not expose batteries to high temperatures, direct sunlight or fire.
  • Do not disassemble, crush or incinerate batteries and do not subject them to temperatures over 80 °C (176 °F).
  • Do not use or charge batteries that have suffered mechanical impact, have been dropped from a height or show signs of damage. In this case, always contact your Hilti  Service .
  • If the battery is too hot to touch it may be defective. Put the battery in a place where it is clearly visible and where there is no risk of fire, at an adequate distance from flammable materials. Allow the battery to cool down. If it is still too hot to touch after an hour, the battery is faulty. Contact Hilti Service .


Product overview

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  1. Adjustable foot
  2. Li‑ion battery
  3. Warning sticker
  4. Selector button for line and receiver mode
  5. Laser exit window
  6. Rotary on/off and pendulum lock switch
  7. Fine adjustment for rotation platform
  8. Circular bubble level

Intended use

This tool is a self-leveling multi-line laser level that allows a single person to transfer right angles, level horizontally, carry out alignment work and plumb accurately.
The tool has three green laser lines (one horizontal and two vertical), a reference point below the tool as well as four beam intersection points (front, back, left, right and above) with a range of approx. 20 m. Range depends on the brightness of ambient light.
The tool is designed for mainly indoor use and is no substitute for a rotating laser level. For outdoor use make sure that the boundary conditions are the same as for indoor use, or else use a Hilti laser receiver.
Possible applications are:
  • Marking the position of partition walls (at right angles and in the vertical plane).
  • Checking and transferring right angles.
  • Aligning components to be installed or sections of a structure in three axes.
  • Transferring points marked on the floor to the ceiling.
The laser lines can be switched on either separately (vertical or horizontal line only) or together. When used with inclination angle, the pendulum for automatic leveling is blocked.
  • Use only Hilti Li‑ion batteries of the B 12 series with this product.
  • Use only Hilti battery chargers of the C4/12 series for charging these batteries.


The tool levels itself automatically within a range of approx. 3.0°. If this is not sufficient, the tool can be leveled using the adjustable feet and circular bubble level. Self-leveling takes only about 3 seconds.
When the self-leveling range is exceeded, the laser beams blink as a warning.
When switched on initially, the tool is in standard mode, i.e. visible beam mode with high line brightness. When the selector button for line and receiver mode is pressed and held for a short time the tool switches to receiver mode and is then compatible with the PMA 31G laser receiver. Receiver mode can be deactivated by again pressing and holding the selector button for a short time or by switching the tool off.

Items supplied

Multi-line laser, toolbox, operating instructions, manufacturer’s certificate.
You can find other system products approved for your product at your local Hilti Center or online at:

Information displayed during operation

The laser beam blinks twice every 10 seconds (pendulum not locked) or every 2 seconds (pendulum locked).
The batteries are almost exhausted.
The laser beam blinks five times and then remains permanently on.
Activation or deactivation of receiver mode.
The laser beam blinks very rapidly.
The tool cannot level itself.
The laser beam blinks every 5 seconds.
Inclined line operating mode; the pendulum is locked, so the lines are not leveled.

Technical data

Range of the lines and intersection point without laser receiver
20 m
(65 ft - 10 in)
Range, lines and intersection point with laser receiver
2 m … 50 m
(6 ft - 10 in … 164 ft)
Self-leveling time (typical)
3 s
Laser class
Class 2, visible, 510-660 nm (EN 60825-1:2008 / IEC 60825-1:2007); Class II (CFR 21 § 1040 (FDA))
Line width (distance 5 m)
< 2.2 mm
(< 0.09 in)
Self-leveling range
±3.0° (typical)
± 2 mm in 10 m
(± 0.1 in in 32 ft - 10 in)
Operating status indicator
Laser beams and the switch positions “Off”, “On locked” and “On unlocked”
Power source
Hilti B 12 Li-ion battery
Battery life (all lines on)
Hilti temperature +24 °C (+72 °F): 7 h (typical)
Battery life (horizontal or vertical lines on)
Hilti temperature +24 °C (+72 °F): 10 h (typical)
Operating temperature
−10 ℃ … 40 ℃
(14 ℉ … 104 ℉)
Storage temperature
−25 ℃ … 63 ℃
(−13 ℉ … 145 ℉)
Dust and water spray protection (except battery compartment)
IP 54 in accordance with IEC 60529
Tripod thread
BSW 5/8"UNC1/4"
Beam divergence
0.05 mrad … 0.08 mrad
Average output power (max.)
< 0.95 mW
Weight including battery
1.24 kg
(2.73 lb)


Risk of injury! Do not direct the laser beam toward persons.
  • Never look directly into the source of the laser beam. In the event of direct eye contact, close your eyes and move your head out of the path of the laser beam.

Inserting the battery

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  • Push the battery in until it engages securely.
    Only the Li-ion batteries recommended by Hilti may be used to power the tool.

Removing / adjusting the base plate

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  1. Remove the base plate by pulling it forward and clear of the device.
  2. The rubber sleeves of the feet can be pulled down to provide protection if the device has to be set up on an easily damaged surface.
  3. The feet of the base plate can be screwed out for leveling.

Switching the laser beams on

  1. Turn the rotary switch to the Image alternative position (on/unlocked).
    • The vertical laser beams are visible.
  2. Press the mode selector button repeatedly until the desired line mode is set.
    The operating modes change in the following sequence and the sequence then repeats itself: Vertical laser lines, horizontal laser line, vertical and horizontal laser lines.

Switching the laser beams off

  • Turn the rotary switch to the OFF position (off/locked).
    • The laser beam is no longer visible and the pendulum is locked.
    The tool switches itself off when the battery is low.

Activating or deactivating laser receiver mode

The range of the laser receiver might be restricted on account of the design-related asymmetry of the laser power and possible disruptive external light sources.
To optimize the range, work on a strong side of the line laser and avoid working in direct light. The strong sides are the rear, where the battery is mounted, and the opposing front.
  1. To activate receiver mode, press the line / receiver mode selector button for longer than 4 seconds until the laser beam flashes five times as confirmation.
  2. To deactivate receiver mode, press the selector button again for longer than 4 seconds.
    Receiver mode is deactivated when the tool is switched off.

Setting the laser beams to the “Inclined line” function

  1. Turn the rotary switch to the Image alternative position (on/locked).
    • Only the horizontal laser beam is then visible.
  2. Press the line mode selector button repeatedly until the desired line mode is set.
    When the “Inclined line” function is active, the pendulum is locked and the tool is not leveled.
    The laser beam(s) blink every 5 seconds.
    The operating modes change in the following sequence and the sequence then repeats itself: Horizontal laser line, vertical laser line, vertical and horizontal laser lines.

Examples of applications

The adjustable feet allow the tool to be pre-leveled approximately on very uneven surfaces.

Transferring heights

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Setting up drywall track for a partition wall

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Vertical alignment of pipes

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Aligning heating units

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Aligning door and window frames

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Checking the plumb point

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  1. Make a mark on the floor (a cross) in a high room (e.g. in a stairwell or hallway with a height of 5–10 m).
  2. Place the tool on an even, level surface.
  3. Switch the tool on and unlock the pendulum.
  4. Position the tool so that the lower plumb beam coincides with the center of the cross marked on the floor.
  5. Mark the top point of intersection of the laser lines on the ceiling. Attach a sheet of paper to the ceiling before making the mark.
  6. Pivot the tool through 90°.
    The lower red plumb beam must remain on the center of the cross.
  7. Mark the top point of intersection of the laser lines on the ceiling.
  8. Repeat the procedure after pivoting the tool through 180° and 270°.
    Form a circle on the ceiling from the 4 marked points. Measure the diameter of the circle D in millimeters or inches and the height of the room in meters or feet.
Image alternative
  1. Calculate the value R.
    • The value R should be less than 3 mm (corresponds to 3 mm at 10 m).
    • The value R should be less than 1/8".

Checking the leveling of the laser beam

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  1. Place the tool on an even, level surface approx. 20 cm from the wall (A) with the point of intersection of the laser lines directed toward the wall (A).
  2. Mark the point of intersection of the laser lines with a cross (1) on wall (A) and with a cross (2) on wall (B).
  3. Place the tool on an even, level surface approx. 20 cm from wall (B) and carefully aim the point of intersection of the laser lines at cross (1) on wall (A).
  4. Use the adjustable feet to adjust the height of the point of intersection of the laser lines so that the point of intersection coincides exactly with the mark (2) on the wall (B). In doing so, make sure that the bubble level remains centered.
  5. Mark the point of intersection of the laser lines again with a cross (3) on the wall (A).
  6. Measure the offset D between the crosses (1) and (3) on the wall (A) (RL = room length).
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  1. Calculate the value R.
    • The value R should be less than 2 mm.
    • The value R should be less than 1/8".

Checking perpendicularity (horizontal)

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  1. Position the tool so that the lower plumb beam coincides with the center of a reference cross marked in the middle of a room at a distance of about 5 m from the walls.
  2. Mark all 4 points of intersection on the four walls.
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  1. Rotate the tool through 90° and make sure that the center of the point of intersection coincides with the first reference point (A).
  2. Mark each new point of intersection and measure each offset (R1, R2, R3, R4 [mm]).
Image alternative
  1. Calculate the offset R (RL = room length).
    • The value R should be less than 3 mm or 1/8".

Checking the accuracy of the vertical line

Image alternative
  1. Position the tool at a height of 2 m (pos.1).
  2. Switch the tool on.
  3. Position the first target plate T1 (vertical) at a distance of 2.5 meters from the tool at the same height (2 meters), so that the vertical laser beam strikes the plate. Mark this position.
  4. Then place the second target plate T2 at a position 2 meters below the first target plate, so that the vertical laser beam strikes the plate. Mark this position.
  5. Mark position 2 at the opposite side of the test setup (mirror image) on the laser line on the floor at a distance of 5 meters from the tool.
  6. Now place the tool on the previously marked position (pos. 2) on the floor.
  7. Align the laser beam so that it strikes the target plate T1 and the position marked on it.
  8. Mark the new position on target plate T2.
  9. Read the distance D between the two marks on target plate T2.
    If the difference D is greater than 2 mm, the tool must be returned to a Hilti repair center for adjustment.

Care and maintenance

Cleaning and drying

  • Blow any dust off the glass.
  • Do not touch the glass surfaces with your fingers.
  • Use only a soft, clean cloth to clean the tool. If necessary, moisten the cloth with a little alcohol or water.
  • Observe the temperature limits when storing your equipment. This is particularly important in summer or winter if the equipment is kept inside a motor vehicle (-25°C to 63°C / -13°F to 145°F).

Hilti Calibration Service

We recommend that the tool is checked by the Hilti Calibration Service at regular intervals in order to verify its reliability in accordance with standards and legal requirements.
Use can be made of the Hilti Calibration Service at any time. Calibration at least once a year is recommended.
The Hilti Calibration Service provides confirmation that the device is in conformance, on the day it is tested, with the specifications given in the operating instructions.
The tool will be readjusted if deviations from the manufacturer’s specification are found.
After checking and adjustment, a calibration sticker applied to the tool and a calibration certificate provide written verification that the tool operates in accordance with the manufacturer’s specification.
Calibration certificates are always required by companies certified according to ISO 900X.
Your local Hilti contact will be pleased to provide further information.

Transport and storage


  • Use the Hilti shipping box or packaging of equivalent quality for transporting or shipping your equipment.


  • Remove the tool from its case if it has become wet.
  • The tool, its carrying case and accessories should be cleaned and dried (at maximum 63 °C/145 °F).
  • Repack the equipment only once it has dried completely and then store it in a dry place.
  • Check the accuracy of the equipment before it is used after a long period of storage or transportation.

Transport and storage of cordless tools and batteries

    Accidental starting during transport !
  • Always transport your products with the batteries removed!
  • Remove the battery/batteries.
  • Never transport batteries loose and unprotected. During transport, batteries should be protected from excessive shock and vibration and isolated from any conductive materials or other batteries that may come in contact with the terminals and cause a short circuit. Comply with the locally applicable regulations for transporting batteries.
  • Do not send batteries through the mail. Consult your shipper for instructions on how to ship undamaged batteries.
  • Prior to each use and before and after prolonged transport, check the product and the batteries for damage.
    Accidental damage caused by defective or leaking batteries !
  • Always store your products with the batteries removed!
  • Store the product and the batteries in a cool and dry place. Comply with the temperature limits stated in the technical data.
  • Do not store batteries on the charger. Always remove the battery from the charger when the charging operation has completed.
  • Never leave batteries in direct sunlight, on sources of heat, or behind glass.
  • Store the product and batteries where they cannot be accessed by children or unauthorized persons.
  • Prior to each use and before and after prolonged storage, check the product and the batteries for damage.


If the trouble you are experiencing is not listed in this table or you are unable to remedy the problem by yourself, please contact Hilti Service.
Trouble or fault
Possible cause
Action to be taken
The tool can’t be switched on.
The battery is low.
  • Charge the battery.
The battery is not fitted correctly.
  • Fit the battery and check that the battery is securely seated in the tool.
The tool or rotary switch is faulty.
  • Have the tool repaired by Hilti Service.
Individual laser beams don’t function.
The laser source or laser control unit is faulty.
  • Have the tool repaired by Hilti Service.
The tool can be switched on but no laser beam is visible.
The laser source or laser control unit is faulty.
  • Have the tool repaired by Hilti Service.
The temperature is too high or too low.
  • Allow the tool to cool down or warm up.
Automatic leveling doesn’t work.
The tool is standing on an excessively inclined surface.
  • Turn the rotary switch to the Image alternative position.
The inclination sensor is faulty.
  • Have the tool repaired by Hilti Service.
The tool switches off after 1 hour.
Automatic switch-off has been activated.
  • Press the selector button for longer than 4 seconds.
The reception range is too short
Working in weak area of the laser.
Lighting conditions on site are too bright
  • Position the laser and / or the laser receiver in an area where the light is not as bright.
Light is shining directly into the detection area.
  • Prevent light from shining directly into the detection area, for example by shading it.
Laser receiver not receiving a laser beam
The laser is not in receiver mode
  • Activate the receiver mode on the line laser.
The laser receiver is too far away from the laser.
  • Position the laser receiver closer to the laser.


Risk of injury due to incorrect disposal! Health hazards due to escaping gases or liquids.
  • DO NOT send batteries through the mail!
  • Cover the terminals with a non-conductive material (such as electrical tape) to prevent short circuiting.
  • Dispose of your battery out of the reach of children.
  • Dispose of the battery at your Hilti Store , or consult your local governmental garbage disposal or public health and safety resources for disposal instructions.
Image alternative Most of the materials from which Hilti tools and appliances are manufactured can be recycled. The materials must be correctly separated before they can be recycled. In many countries, your old tools, machines or appliances can be returned to Hilti for recycling. Ask Hilti Service or your Hilti representative for further information.
In accordance with the European Directive on waste electrical and electronic equipment and its implementation in conformance with national law, electric tools or appliances that have reached the end of their life must be collected separately and returned to an environmentally compatible recycling facility.
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  • Do not dispose of electronic measuring tools together with household waste.

Manufacturer’s warranty

  • Please contact your local Hilti representative if you have questions about the warranty conditions.

FCC statement (applicable in US) / IC statement (applicable in Canada)

This device complies with Part 15 of the FCC Rules and CAN ICES-3 (B) / NMB-3 (B). Operation is subject to the following two conditions:
  1. This device shall cause no harmful interference.
  2. This device must accept any interference received, including interference that may cause undesired operation.
Changes or modifications not expressly approved by Hilti may restrict the user’s authorization to operate the equipment.