Sensor is modelled on the spectral sensitivity of the human eye
Hold function, min/max values
Protective cap for safe storage
The testo 540 light meter is a quick and easy-to-use entry level model designed for measuring lighting conditions in the workplace. The testo 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.
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: 0.5s