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testo 540 - Lux Meter

testo 540
testo 540
The testo 540 is a compact, easy-to-use lux meter designed for quick measurements of both artificial and natural light. It is ideal for use in workplaces, offices, and shops, helping you ensure optimal lighting conditions. With its simple design and useful features like a hold function and min/max values, the testo 540 is the perfect choice for those looking for a reliable entry-level light meter.
  • Quick & Easy Measurements – Ideal for spot checks of lighting conditions in workplaces, offices, and shops.
  • Spectral Sensitivity – Sensor modeled on the human eye’s spectral sensitivity for more accurate results.
  • Convenient Features – Includes hold function, min/max value display, and protective cap for storage.
  • Compact & Portable – Small, lightweight, and easy to carry for quick checks anywhere.
The testo 540 lux meter is an entry-level model specifically designed for measuring light levels in workplaces, shops, and offices. Whether you’re assessing artificial or natural light, this compact and user-friendly device offers an efficient way to ensure proper lighting conditions.

The light sensor of the testo 540 is modeled on the spectral sensitivity of the human eye, making it an ideal choice for realistic lighting assessments. It offers several useful functions, such as:
  • Hold Function: Freeze the most recent measurement on the display for easy reference.
  • Min/Max Values: Quickly check the highest and lowest light readings.
  • Protective Cap: Safely store the meter when not in use.

This lux meter is especially handy for professionals needing to check lighting compliance in various work environments, ensuring optimal working conditions. Its compact size makes it easy to carry and store, while the large, easy-to-read display ensures visibility even in dimly lit areas.
Ideal For:
  • Workplace Lighting Inspections: Ideal for checking workplace lighting conditions and ensuring they meet health and safety standards.
  • Shops and Offices: Great for retail spaces or offices where lighting levels need to be monitored regularly.
  • Quick Spot Checks: Its simple design makes it perfect for quick, spot checks of light levels.

Light

Measuring range
0 to 99999 Lux
0 to 9300 ftc
Accuracy
±3 Lux or ±3 % (compared to reference instrument at 90° light irradiation)
Resolution
1 Lux (0 to 19999 Lux)
10 Lux (Remaining Range)
Measuring rate
0.5 s

General technical data

Weight
95 g (incl. batteries and protective cap)
Dimensions
133 x 46 x 25 mm
Operating temperature
0 to +50 °C
Protection class
IP40
Battery type
2 AAA micro batteries
Battery life
200 h (average, without display illumination)
Storage temperature
-40 to +70 °C

testo 540 lux meter, protective cap, calibration protocol, batteries.

Contact Us
Testo Ltd
Newman Lane
GU34 2URAlton
HampshireUnited Kingdom
01420 544433

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