Bosch GLM Laser Tape Measure

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The Bosch GLM Laser Tape Measure are professional digital distance measuring tools available in multiple models: GLM 20 (20m), GLM 40 (40m), GLM 50-22 (50m, IP65), GLM 50-22 G (50m, green laser), GLM 100-25 C (100m, Bluetooth), and GLM 120 C (120m, Bluetooth). All models feature Class 2 lasers, illuminated displays, and run on AAA or AA batteries. Suitable for architects, electricians, plumbers, painters, carpenters, and facilities managers.
Description

Table of Contents

Bosch GLM Laser Tape Measure

PRIMARY USES

1. Distance Measurement for Construction and Renovation
Primary Use: A handheld digital laser measuring tool (available in ranges from 20m to 120m) used for fast, accurate distance measurement in construction, renovation, and interior fit-out projects. Essential for measuring room dimensions, wall lengths, ceiling heights, and spacing for installations.
How it helps: For builders, electricians, plumbers, and facilities managers, the laser tape measure provides instant, one-person measurements without the need for a second person to hold the tape end. The GLM 20 offers compact, basic measurement, while the GLM 40 adds area and volume calculation. The GLM 50-22 and 50-22G extend range to 50m with IP65 protection for job sites. The GLM 100-25C and GLM 120C provide up to 100-120m range with Bluetooth connectivity for data documentation. All models feature intuitive interfaces and illuminate displays for easy reading.
2. Area and Volume Calculation
Primary Use: Automatically calculates floor areas, wall surfaces, and room volumes from measured dimensions – essential for estimating material requirements for flooring, tiling, painting, and other finishing work.
How it helps: Simply measure length and width, and the tool instantly calculates the surface area. Measure height as well for volume calculation. This eliminates manual calculations, reducing errors and saving time on estimating materials. The GLM 40 and above offer AutoSum function for adding multiple measurements. The GLM 50-22 and higher models feature a colour display with Big Numbers Mode for improved readability on construction sites.
3. Indirect Height Measurement (Pythagorean Function)
Primary Use: Calculates heights and inaccessible distances using the Pythagorean theorem – ideal for measuring room heights, building heights, and distances that cannot be reached directly.
How it helps: Without climbing ladders or using cumbersome equipment, the user can measure the distance to a point and the angle (on select models) to calculate height. This is particularly useful for facilities management, electrical installations, and building surveys where access is limited or safety is a concern. The GLM 50-22 and above models include this function. The GLM 50-22 G features a green laser spot for improved visibility in bright conditions, making outdoor and long-distance measurements easier. The GLM 120C with Bluetooth enables data transfer to the Bosch MeasureOn App for documentation.

SECONDARY USES

1. Material Estimation: The tool calculates surface areas and volumes for estimating paint, tile, flooring, and other material quantities, reducing waste and ensuring accurate ordering.
2. Layout and Positioning: For electricians, HVAC installers, and plumbers, the laser tape measure ensures precise placement of fixtures, sockets, pipes, and equipment according to plans.
3. Documentation and Reporting: With Bluetooth models (GLM 100-25C and GLM 120C), measurements can be transferred directly to smartphones and tablets for reporting, invoicing, and project documentation.
4. Tripod Mounting: All 50m models and above feature a 1/4″ tripod thread, allowing stable, hands-free measurement for long distances and precise alignment.
5. Continuous Measurement: For tasks requiring constant measurement, the tool offers a tracking function (measurement while moving), useful for layout and checking parallel surfaces.
About brand
**Bosch** is a leading German brand founded in **1886**, renowned for its high-quality, innovative, and reliable engineering solutions. In the hardware industry, Bosch is best known for its durable power tools, measuring equipment, and accessories, trusted by professionals and DIY users worldwide. With a strong focus on performance, precision, and innovation, Bosch continues to set the standard for quality in construction, manufacturing, and home improvement.
KEY PRODUCT FEATURES

1. BASIC IDENTIFICATION ATTRIBUTES

  • Device Type: Handheld laser distance measurer; not a medical device.
  • Designation:
    • Bosch GLM 20 (20m range)
    • Bosch GLM 40 (40m range)
    • Bosch GLM 50-22 (50m range)
    • Bosch GLM 50-22 G (50m range, green laser)
    • Bosch GLM 100-25 C (100m range, Bluetooth)
    • Bosch GLM 120 C (120m range, Bluetooth)
  • Measuring Range: 0.15 – 20m / 40m / 50m / 100m / 120m
  • Accuracy: ± 3.0mm (GLM 20) / ± 1.5mm (all other models)
  • Laser Diode: 635nm (red) / 515nm (green – G models), < 1mW
  • Laser Class: Class 2
  • Country of Origin: China

2. TECHNICAL & PERFORMANCE PROPERTIES

  • Primary Action: Distance measurement via time-of-flight laser technology.
  • Measurement Time: < 0.5s (typical) / 4s (maximum).
  • Display: Standard (GLM 20) / Illuminated 3-line (GLM 40) / Colour display with Big Numbers Mode (GLM 50+ models).
  • Power Supply: 2 x 1.5V LR03 (AAA) batteries or LR6 (AA) batteries (as per model).
  • Automatic Deactivation: 5 minutes (power saving).
  • Protection: IP54 (GLM 40) / IP65 (GLM 50+ models) – dust-tight and water jet resistant.
  • Drop Protection: Up to 1.5m on concrete (GLM 50+ models).
  • Memory: 10 measurements (GLM 40) / 30 measurements (GLM 50+ models).
  • Functions: Length, area, volume, continuous measurement, indirect height (Pythagorean), AutoSum, addition/subtraction.

3. PHYSICAL & OPERATIONAL PROPERTIES

  • Preparation: Insert batteries. Check laser aperture for dirt. Select measurement starting point (front/rear/tripod thread as applicable).
  • Usage Instructions: Point laser at target surface. Press measure button. Ensure stable, solid surface for reflection. For outdoor/long-distance use, use target plate (optional accessory).
  • Measurement Reference: Measurements can be taken from the front edge, rear edge, or tripod thread (50m+ models).
  • Storage Conditions: Store in a dry, secure place within temperature range of -10°C to +45°C.
  • Cleaning: Clean housing with soft, dry cloth. Do not use solvents or immerse in water.
  • Tripod Thread: 1/4" thread on GLM 50+ models for stable, hands-free measurement.
  • Bluetooth Connectivity: Bosch GLM 100-25 C and Bosch GLM 120 C connect to Bosch MeasureOn App for data transfer, documentation, and floor plan creation.

4. SAFETY & COMPLIANCE ATTRIBUTES

  • Safety Classification: Class 2 laser product (≤ 1mW, visible light). Avoid direct eye exposure. Do not point at people or animals.
  • Laser Safety: Complies with IEC 60825-1:2014 standard.
  • Environmental Protection: IP54 (Bosch GLM 40) / IP65 (Bosch GLM 50+ models) – protected against dust ingress and water jets.
  • Impact Resistance: Up to 1.5m drop-proof (Bosch GLM 50+ models).
  • Electromagnetic Compatibility: Complies with applicable EMC standards.
  • Regulatory: Complies with relevant CE and UKCA standards.
  • Battery Safety: Use only recommended battery types. Do not short-circuit or dispose of in fire.

5. STORAGE & HANDLING ATTRIBUTES

  • Storage: Store in a dry, secure place. Remove batteries if storing for extended periods.
  • Inspection: Regularly inspect device for damage. Check laser aperture for cleanliness.
  • Usage: Do not use in explosive atmospheres or near flammable materials. Avoid measuring through glass or transparent surfaces (may cause errors).
SAFETY HANDLING PRECAUTIONS

1. SAFETY PRECAUTIONS

Laser Safety: This device is a Class 2 laser product. Do not stare directly into the laser beam. Do not point the laser at mirrors, reflective surfaces, or into the eyes of people or animals. Use protective eyewear only for beam identification, not for laser protection.
Environmental Safety: Do not use the tool in rain or wet conditions (except IP54/IP65 rated models for splashes/water jets). Avoid extreme temperatures. Do not immerse in water.
Battery Safety: Use only recommended batteries. Do not mix old and new batteries. Remove batteries if device will not be used for long periods. Recycle batteries responsibly.
Operational Safety: Ensure the target surface is stable and reflective. Measuring through transparent materials (glass, plastic) will produce incorrect results. For long-distance or outdoor measurements, use a target plate.
Maintenance: Clean laser aperture regularly with a soft cloth. Do not use aggressive cleaning agents. Have repairs performed only by authorised service centres.
Training requirement: Operators should be familiar with basic measurement functions and safety precautions. Supervisors should ensure all safety protocols are followed, particularly regarding laser safety. 

2. FIRST AID MEASURES

Eye Exposure (laser beam): If laser beam enters the eye, close eyes and turn head away immediately. If irritation persists, seek medical attention.
Skin Contact: Generally not harmful. If irritation develops, wash with soap and water.
Battery Leakage: Avoid skin contact with battery acid. Wash affected area with soap and water. Seek medical attention if irritation occurs. If acid enters eyes, rinse with plenty of clean water for at least 15 minutes and seek immediate medical attention.
Inhalation: Not applicable for normal use.
Ingestion: Not applicable for normal use.

3. FIRE FIGHTING MEASURES

Flammability: Device housing is not highly flammable but may burn if exposed to fire. Batteries may leak or rupture if exposed to high temperatures.
Extinguishing Media: Use water spray, foam, dry chemical powder, or carbon dioxide (CO₂) for fires involving tools.
Fire Response: In event of fire, evacuate the area and call emergency services. Use appropriate extinguishers. Do not inhale fumes from burning batteries or plastics.