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Pocket-sized lux meter (testo 540)

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For quick and easy light measurements in the workplace. Sensor is modelled on the spectral sensitivity of the human eye. For quick and easy light measurements in the workplace. Protective cap for safe storage


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Pocket-sized lux meter (testo 540)

The testo 540 lux 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 lux meter is a pocket-sized entry level model designed specifically for carrying out spot checks in the workplace, shops and offices. The light sensor is modelled 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 lux 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.

Delivery scope

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

Technical Data

Light Measuring range
0 to 99999 Lux
0 to 9300 ftc
±3 Lux or ±3 % (compared to reference Class B, DIN 5032 Part 7)
1 Lux (0 to 19999 Lux)
10 Lux (Remaining Range)
Measuring rate
0.5 s
General technical data Dimensions
133 x 46 x 25 mm
Operating temperature
0 to +50 °C
Protection class
Battery type
2 AAA micro batteries
Battery life
200 h (average, without display illumination)
Storage temperature
-40 to +70 °C
95 g (incl. batteries and protective cap)


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