Measures sound levels, light levels, %RH and temperature. Range - Sound 35 to 130dB, Lux 0 to 20, 000 lux, %RH 25% to 95%RH, Temperature -20 to +750C.Resolution - Sound 0.1dB, Lux 0.01 Lux, %RH 0.1%RH, Temperature 0.1C.Accuracy - Sound 3.5dB, Lux 5%+10dgts, %RH 5%RH, Temperature 3.5%rdg 2C.Supplied in a carry case with lux probe, humidity/temperature probe, K-Type wire probe, wind muffler and battery.Power - 1 x 9V PP3 alkaline battery (LR-61) .Dimensions 250 x 63.8 x 40mm.Weight 250g.Features:The LCD display has large digits and function indicators.2 ranges for sound with selectable A or C frequency weightings.Cosine corrected silicon diode sensor for Lux levels.Semiconductor sensors in the probe for humidity and ambient temperature measurements.K-Type input for C or F temperature measurements.28mm LCD display with function indicators.Data hold function freezes displayed value.Max hold displays highest measured value.Max memory displays highest measured value since power on.Auto power