testo 540 handy Lux meter incl. protection cap, batteries and calibration protocol Testo 540 Handy Lux meter incl. protection cap, batteries and calibration protocol The sensor of the testo 540 is adapted to the spectral sensitivity of the eye. This makes testo ideal for the measurement of light intensity. The Hold function allows an easy readout of the measurement values. Max. and min. values are displayed at the press of a button. testo 540 is very handy, small and easy to operate. Hold function and max./min. values Incl. calibration protocol Protective cap for safe storage Including wrist strap and belt holder Sensor adapted to spectral sensitivity of the eye Display light Storage temperature -40 to +70 °C Operating temperature 0 to +50 °C Battery type 2 batteries Type AAA Battery life 200 h Weight 95 g Dimensions 133 x 46 x 25 mm Probe type Lux Meas. Range 0 to 99,999 Lux Accuracy ±3 % Resolution 1 Lux (0 to 19.999 Lux) 10 Lux (remaining range) Light meter Lux meter Testo 205 Testo 540 à¤Ã×èͧÇÑ´¤ÇÒÁà¢éÁáʧ à¤Ã×èͧÇÑ´áʧ