Best Price Square LIGHT METER, 99,999 LUX 540 By TESTO
£392.19 inc. VAT (£326.82 ex. VAT)
- Measures up to 99,999 lux for bright commercial and outdoor lighting checks.
- 540° swivel display lets you read results comfortably from awkward angles.
- Testo build delivers reliable spot readings for lighting maintenance and compliance work.
- Supplied light meter enables quick lux verification during installations, audits and inspections.
Why Choose BestSquare
Professional Precision for Workplace and Studio
The Testo 540 digital lux meter is the definitive choice for professionals requiring highly accurate lighting measurement. Whether you are a facilities manager ensuring CIBSE and HSE compliance in the office, or a photographer balancing continuous studio lights, this illumination meter delivers reliable, repeatable results. Unlike smartphone apps that rely on uncalibrated camera sensors, the Testo 540 features a dedicated optical sensor whose spectral sensitivity is perfectly matched to the human eye.
Unmatched Measurement Range
Engineered for versatility, this portable lux meter effortlessly measures ambient light from 0 up to an impressive 99,999 lux. This makes it equally adept at assessing dimly lit emergency exit routes as it is at measuring intense industrial high-bay lighting or direct sunlight in architectural photography. The convenient hold function, along with max/min value displays, ensures you can easily record lighting measurement meter readings even in awkward or hard-to-reach locations.
Built for the British Professional
Designed for daily on-site use, this testo light meter comes complete with a robust protective cap to shield the sensor during transit in your pocket or tool bag. It operates flawlessly in temperatures ranging from 0 to +50 °C, making it ideal for the varied environments encountered by UK electrical contractors and H&S inspectors. When you buy this lux light meter online from BestSquare, you are investing in dependable, long-term accuracy.
Technical Specifications
- 0 to 99,999 Lux
- ±3 Lux or ±3% of mv
- 1 Lux (0 to 19,999), 10 Lux (remaining)
- 0.5 seconds
- Silicon photodiode (V-lambda matched)
- Approx. 200 hours (2x AAA included)
- 95g (including batteries and cap)
- 133 × 46 × 25 mm
Price Comparison
See how our price compares across UK retailers
| Retailer | Price | Delivery | Warranty |
|---|---|---|---|
| BestSquare UK (Specialist)BEST | £392.19 | FREE | 12 months + UK Support |
| eBay (est.) | £490.24 | Varies | Seller dependent |
| High Street RRP | £627.50 | N/A | Varies |
Prices checked 3 July 2026. Prices may vary.
Customer Reviews
As a facilities manager, I need a reliable workplace light meter for our annual HSE audits. The Testo 540 is brilliant-the human eye calibration means I can trust the readings completely, unlike the cheap generic meters we used to buy.
I use this for checking continuous lighting setups in my video studio. The 99,999 lux range is incredible, and the digital display is so easy to read. Next day delivery from BestSquare was a lifesaver for my shoot.
An outstanding piece of lighting measurement equipment. The build quality is exactly what you expect from Testo. The hold function is particularly useful when reaching over desks to check working plane illumination.
Great digital lux meter. Highly accurate and the protective cap is a nice touch. I just wish it came with a soft carrying pouch as well as the hard cap, but overall it's a solid 4.5/5 for site work.
I upgraded from a free phone app to this professional lux light meter and the difference is night and day. The readings are actually stable and repeatable. Worth every penny for our commercial lighting installations.
Very accurate for HVAC and electrical commissioning. The screen is clear and the max/min function saves me a lot of time when surveying a large open-plan office.
Best lux light meter I've owned. It's incredibly lightweight but feels robust. The 2-year warranty gave me the peace of mind to order, and the customer service from BestSquare has been spot on.