... , and reliability. I. Features l 4.5Bit LCD display, multi-unit display modes for shift: nW,uW, mW,dBm,dBl ... switchingl Automatic turn-off time can be setl Automatic resetl Multi wavelength measurement, Auto frequency identifying: 270Hz1kHz2kHzl Data memory function. ... alkaline cellsWorking temperature -1050Storage temperature -4070External dimensionsmm140×72×38WeightKg0.25 Optical Power Meter