GLL 20-22 G Professional - Laser level BOSCH - Free user manual and instructions
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| Product Type | Cross-line Laser Level |
| Brand | Bosch |
| Model | GLL 20-22 G Professional |
| Category | Professional Laser Level |
| Dimensions (approx.) | 120 x 80 x 60 mm |
| Weight (with batteries) | Approx. 0.5 kg |
| Power Supply | 2 AA batteries (1.5 V) |
| Battery Life (approx.) | Up to 20 hours |
| Laser Type | Red diode laser, class 2 |
| Working Range | Up to 20 m (with receiver) |
| Leveling Accuracy | ± 0.3 mm/m |
| Self-leveling | Yes, compensation range ± 4° |
| Main Functions | Horizontal and vertical line projection, slope mode |
| Slope Mode | Yes, deactivates self-leveling |
| Mounting | 1/4" tripod thread |
| Protection | IP54 (splash and dust protection) |
| Operating Temperature | -10 °C to +50 °C |
| Maintenance and Cleaning | Clean optics with a soft dry cloth; avoid solvents |
| Safety | Do not look directly into the beam; use protective glasses if necessary |
| Spare Parts and Repairability | Standard batteries; repair by Bosch authorized service center |
| General Information | Manual available in multiple languages on Bosch website |
Frequently Asked Questions - GLL 20-22 G Professional BOSCH
How to turn on the Bosch GLL 20-22 G Professional laser level?
Press the on/off button on the side of the device. A green indicator light turns on. Use the dial to select the projection mode (horizontal line, vertical line, or cross line).
What is the maximum range of the laser?
The range is about 20 meters in diameter. With a Bosch laser receiver, it can reach up to 50 meters. Actual range depends on ambient brightness.
How to use slope mode on the GLL 20-22 G?
To deactivate self-leveling, press and hold the compensation button for 3 seconds. The device flashes and you can tilt the laser to project sloped lines. Press again to reactivate self-leveling.
Which batteries to use and how to change them?
Use two AA alkaline batteries. Open the battery compartment on the back of the device by sliding the cover. Insert the batteries observing polarity. Close the cover. Remove batteries if not used for a long time.
How to check the accuracy of the laser level?
Perform a calibration test: place the laser on a tripod 1 m from a wall, mark the point, then rotate it 180° and check the deviation. Accuracy is ±0.3 mm/m. If deviation exceeds tolerance, have the device recalibrated by Bosch.
Is the laser waterproof?
The Bosch GLL 20-22 G Professional has IP54 protection, meaning it is protected against water splashes and dust. It is not submersible. Avoid heavy rain.
How to clean the laser lens?
Use a soft dry cloth to wipe the lens. Never use solvents, abrasive products, or liquids. If the lens is very dirty, slightly dampen the cloth with water.
What to do if the device does not turn on?
Check the batteries: insert new batteries or recharge if rechargeable. Also check the compartment for corrosion. If the problem persists, contact Bosch customer service.
Can I use the laser with a tripod?
Yes, the GLL 20-22 G is compatible with all standard tripods with a 1/4-inch screw. Screw the provided adapter or directly the laser onto the tripod.
How to get the user manual in French?
The manual is available free as a PDF on the Bosch website or on platforms like notice-facile.com. You can download it or request a printed version from your dealer.
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USER MANUAL GLL 20-22 G Professional BOSCH
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Product information
Brand : BOSCH
Model : GLL 20-22 G Professional
Category : Laser level