Distance Measures

About Distance Measures

Distance measures, also known as laser measures or laser distance meters, have revolutionised the way tradespeople and DIY enthusiasts take measurements. Gone are the days of struggling with tape measures across long distances or trying to get accurate readings in awkward spaces. These digital measuring tools use laser technology to instantly calculate distances, areas, and volumes with pinpoint accuracy, often to within just a few millimetres. Whether you're a professional surveyor measuring room dimensions for quotes, a builder checking site measurements, or a homeowner planning a renovation project, distance measures deliver fast, reliable results that eliminate human error and save valuable time on site.

The range of distance measures available today caters to every level of user and budget. Entry-level models like the Bosch ZAMO 4 offer straightforward point-and-shoot distance measurement, perfect for occasional DIY use and simple room measurements. Mid-range options from Bosch Professional, DeWalt, and Stanley provide enhanced accuracy and additional functions such as area and volume calculation, Pythagoras functions for indirect measurements, and memory storage for multiple readings. At the professional end, advanced models like the Bosch GLM 150-27 C and Makita laser measures feature Bluetooth connectivity, colour displays, integrated spirit levels, and the ability to transfer measurements directly to smartphones or tablets for immediate documentation and sharing with clients or colleagues.

Modern distance measures have become indispensable tools across the construction and home improvement industries. With maximum measuring ranges extending from 20 metres on compact models up to 150 metres or more on professional-grade devices, there's a solution for every application. Green laser technology, available on select Bosch and other professional models, offers improved visibility in bright conditions and outdoor use, whilst built-in inclinometers allow for angle measurements alongside distance. Many current models are also dustproof and splash-resistant, meeting IP54 or higher ratings for reliable performance in demanding site conditions.

Jargon Buster

• Laser Classification: Most distance measures use Class 2 lasers, which are safe for momentary viewing but should not be stared into directly. Class 2 lasers are suitable for indoor and most outdoor applications without special safety equipment.
• Maximum Range: The furthest distance a laser measure can accurately measure, typically between 20m and 150m depending on the model. Professional tools offer greater range for larger construction sites and surveying work.
• Accuracy Rating: Usually expressed as ±1.5mm to ±3mm, this indicates how close to the true measurement the device will read. Professional models generally offer ±1.5mm accuracy for precision work.
• Pythagoras Function: An indirect measurement feature that calculates distances you cannot measure directly (such as height or width) by taking two reference measurements and using trigonometry to determine the target dimension.
• IP Rating: Ingress Protection rating indicating dust and water resistance. IP54 means protection against dust and water splashes, whilst IP65 offers complete dust protection and resistance to water jets—essential for outdoor site work.
• Green Laser Technology: Green lasers are up to four times more visible than traditional red lasers, making them easier to see in bright conditions, daylight, and over longer distances.

Who Uses Distance Measures?

Distance measures are essential tools for a wide range of professionals and DIY enthusiasts:

• Builders and General Contractors: Quick site measurements, room dimensions, and material calculations for accurate quotes and planning
• Electricians: Measuring cable runs, positioning of fixtures, and calculating areas for lighting layouts
• Plumbers and Heating Engineers: Pipe run measurements and room volumes for heating system sizing
• Carpenters and Joiners: Precise measurements for bespoke furniture, fitted kitchens, and carpentry projects
• Decorators and Painters: Calculating wall areas for paint and wallpaper quantities
• Tilers and Flooring Specialists: Accurate floor and wall area calculations for material ordering
• Estate Agents and Surveyors: Professional room measurements for property particulars and surveys
• Interior Designers: Space planning and furniture placement measurements
• Scaffolders and Access Specialists: Height measurements for safe scaffold erection planning
• DIY Enthusiasts and Homeowners: Home improvement projects, furniture positioning, and garden planning

How to Choose the Right Distance Measures

Maximum Range Requirements: Consider the typical distances you'll be measuring. For domestic use and small rooms, a 20-30 metre range like the DeWalt DWHT77100 or Bosch ZAMO 4 is perfectly adequate. Tradespeople working on larger sites should consider 50-100 metre models such as the Bosch GLM 50-27 CG or Stanley options. For surveying work or large commercial sites, invest in professional 150-metre models like the Bosch GLM 150-27 C.

Accuracy Level: Basic models typically offer ±3mm accuracy, sufficient for general building work and DIY. Professional applications requiring precision—such as fitted furniture making, surveying, or quality control—demand ±1.5mm accuracy found in Bosch Professional, Makita, and DeWalt professional-grade models.

Essential Functions: At minimum, look for simple distance measurement with clear display. Area and volume calculation functions are invaluable for ordering materials and estimating costs. Continuous measurement mode helps when positioning objects or marking out rooms. Memory functions allow storage of multiple readings—essential for professional use when measuring multiple rooms or preparing quotes.

Advanced Features: Professional users benefit from Pythagoras functions for indirect height and width measurements, integrated spirit levels or inclinometers for angle measurements, and Bluetooth connectivity for transferring measurements to smartphones or tablets. The Bosch GLM 100-25 C and similar connected models streamline documentation and reduce transcription errors. Colour displays improve visibility, whilst backlit screens help in dark spaces.

Build Quality and Durability: Site conditions demand robust construction. Look for IP54 minimum rating for dust and splash protection, with IP65 preferred for exterior work or wet environments. Rubber overmoulding provides shock protection from drops—inevitable on busy sites. Stabila and Bosch Professional models are renowned for jobsite durability.

Laser Colour: Red lasers suit most indoor applications and are more economical. Green laser technology, available on models like the Bosch GLM 50-25 G and GCL 2-15 kit, offers superior visibility outdoors and in bright conditions—worth the premium for exterior work or large, well-lit spaces.

Power Source: Most modern distance measures use rechargeable lithium-ion batteries or standard AAA batteries. Rechargeable models reduce running costs for frequent users, whilst AAA-powered units offer the convenience of easily replaceable batteries on site. Check battery life specifications—professional models should deliver hundreds of measurements per charge.

Budget Considerations: Entry-level models from Bosch DIY range start around £30-50 and suit occasional domestic use. Mid-range tools (£60-120) from Stanley, DeWalt, and Bosch offer the features most tradespeople need for daily work. Professional models (£150-300+) from Bosch Professional, Makita, and Stabila provide the accuracy, connectivity, and durability that professionals rely on for business-critical measurements.

Popular Accessories

• Target Plates: Reflective plates that improve laser visibility over long distances and on reflective or transparent surfaces, extending effective range and accuracy in challenging conditions
• Protective Pouches and Cases: Padded carrying cases protect your investment from knocks and drops, with belt loops for convenient access on site
• Tripods and Mounting Adapters: Standard camera tripod threads on many models allow stable mounting for precise measurements over long distances or when using advanced functions
• Battery Adapters: Convert your distance measure to use batteries from your existing cordless tool system—particularly useful with Bosch Professional Li-Ion adapter for 10.8V/12V batteries
• Measurement Apps: Companion smartphone apps for Bluetooth-enabled models allow digital floor plans, photo documentation with measurements, and instant sharing with clients and colleagues
• Calibration Certificates: For professional surveyors and quality control applications, certified calibration documentation ensures measurements meet industry standards and regulatory requirements

Safety Information

Distance measures use Class 2 lasers which are generally safe for brief accidental viewing, but users should never deliberately stare into the laser beam or point it at people or animals. The laser can cause eye discomfort and temporary vision impairment. Always read and follow the manufacturer's safety instructions before use.

When working on construction sites, ensure you wear appropriate PPE including safety footwear and, where required, hard hats and high-visibility clothing. Distance measures should not replace physical barriers or safety measures when working at height or near edges—always follow HSE guidelines and site-specific safety protocols.

Be aware of your surroundings when taking measurements, particularly on active worksites with moving machinery, vehicles, or other tradespeople. Ensure stable footing when measuring, especially on uneven ground, scaffolding, or ladders. Store your laser measure securely when not in use to prevent accidental activation or damage from drops.

Frequently Asked Questions

How accurate are laser distance measures compared to tape measures?

Quality laser measures are significantly more accurate than manual tape measures, with professional models offering ±1.5mm accuracy over distances up to 150 metres. Tape measures are prone to sagging, misreading, and human error, particularly over longer distances. For most construction and surveying work, a laser measure provides faster, more reliable measurements with consistent accuracy that eliminates the variables affecting traditional measuring methods.

Can I use a laser distance measure outdoors?

Yes, though performance varies by model and conditions. Red lasers can be difficult to see in bright sunlight—green laser models like the Bosch GLM 50-25 G offer up to four times better visibility outdoors. For best results in bright conditions, use a target plate, work in shade where possible, or choose a model specifically designed for outdoor use. Check the IP rating to ensure your device can withstand weather conditions—IP54 minimum for light rain, IP65 for more robust weather protection.

Do laser measures work on all surfaces?

Most surfaces work well, including walls, ceilings, floors, and wood. Challenges can occur with highly reflective surfaces (mirrors, polished metal), transparent materials (glass, clear plastic), or very dark, light-absorbing surfaces. For problematic surfaces, use a target plate or hold a piece of card against the surface as a target. Modern Bosch Professional and Makita models include enhanced detection technology that improves performance on difficult surfaces.

How do I measure height when I can't get directly underneath?

Use the Pythagoras function available on mid-range and professional models. This indirect measurement feature allows you to calculate height by taking two measurements from accessible positions—the device automatically calculates the third dimension using trigonometry. This is invaluable for measuring ceiling heights, building elevations, or any dimension you cannot measure directly. Consult your device manual for specific instructions, as the process varies slightly between manufacturers.

What's the difference between Bosch DIY and Bosch Professional laser measures?

Bosch Professional models (GLM series) are designed for daily commercial use with superior accuracy (typically ±1.5mm vs ±3mm), longer range, more robust construction with higher IP ratings, and advanced features like Bluetooth connectivity, colour displays, and extended battery life. The DIY range (ZAMO, UNIVERSALDISTANCE, ADVANCEDDISTANCE) offers excellent value for occasional use and simpler applications, with good accuracy and reliability but fewer professional features. For tradespeople using the tool daily, Professional models justify the investment; for homeowners and occasional users, DIY models provide perfectly adequate performance.