testo 540 Pocket Lux Meter

The Testo 540 light meter is a quick and easy-to-use entry level model designed for measuring lighting conditions in the workplace.

The 540 light meter can be used to measure both artificial and natural light and provides you with a quick and easy means of measuring lighting conditions in the workplace.

The testo 540 lux meter: compact, easy-to-use, precise

The Testo 540 light meter is a compact entry level model designed specifically for carrying out spot checks in the workplace, shops and offices. The light sensor is designed based on the spectral sensitivity of the human eye and is ideal for measuring lighting conditions in a variety of different workplaces.

The compact, easy-to-use meter has a number of useful functions and features including a large, easy-to-read display, min/max values which can be shown at the touch of a button, a hold function that allows you to freeze the last reading and a protective cap for safe storage.

More Information
Warranty 2 Years
Technical Data
Storage Temperature -40 to +70 °C
Operating temperature  - 0 to +50 °C 
Battery type AAA micro batteries
Battery life 50 h 
Dimensions  119 x 46 x 25 mm 
Instrument Sensor
Measuring range   0 to 99999 Lux 
Accuracy  ±0.5 °C 
±3 Lux ±3 % of mv 
(compared to reference Class B, DIN 5032 Part 7
Resolution  1 Lux (0 to 19999Lux) 10Lux(remaining range)
What's Included

Testo 540 lux meter, protective cap, calibration protocol certificate, batteries

Sensor designed based on the 
spectral sensitivity of the human eye 

Quick readouts

Protective cap for safe storage

Compact and robust design