The pocket-line Testo 540 is a light meter for measuring ambient light conditions. Features backlit display, hold and minimum/maximum facility and units in Lux or footcandles. Unit supplied complete with protection cap, wrist strap and 2 x AAA alkaline batteries.

Operating range : 0 - 99,999 Lux
Resolution : 1 Lux (0 - 19,999 Lux) 10 Lux (20,000 - 99,999 Lux)
Operating
temperature : 0 - 50°C`
Dimensions : 133 mm x 46 mm x 25 mm