This 3 in 1 digital sound level meter(sound level+temperature+humidity) is widely used to test noise at work,occupational noise and environmental and community noise.The environmental meter is also used in vehicle noise testing and other specialised applications. Count: 1999
Sound level  range: 30dB~130dB
Sound accuracy: ±2dB (30Hz ~ 8kHz)
Sound resolution: 0.1dB
Sound sampling rate: fast 4times/S,Slow 1time/S
Temperature range: -20to60°C
Temperature accuracy: ±0.9 °C, 40 °C~ 60 °C
±0.5 °C, 5 °C~ 40 °C
±1.1 °C, -20 °C~ 5 °C
Temperature resolution: 0.1°C
Relative humidity range: 10 % ~ 90 % RH
Relative humidity accuracy: ±2 % RH(10 % RH ~ 90 % RH)
Relative humidity resolution: 1%
Data hold: √
Back light: √
Low battery indication: √
Over range indication:   "UNDER"or "OVER"
AUTO RANGE or manual range: √
Fast or slow mode selected : √
Max Value : √
Power supply: 6x1.5V AAA
Dimension : 278x80x38mm