Digital Sound Level Meter Decibel Noise Tester 30~130dBA Audio Volume Factory Pre-C A C Frequency With Sponge Ball

Hign-concerned Chemical : None Measurement Range : 30~130dB Model Number : SLM-269 Origin : Mainland China Certification : CE Type : Sound Level Meter Level range : 30~80dB, 50~100dB, 60~110dB, 80~130dB, 30~130dB Microphone : 1/2 inch electret condenser microphone Frequency weighting : A / C Accuracy : +/- 1.5dB (under reference condition) Resolution : 0.1dB Frequency range : 31.5Hz~8.5KHz Time weighting : FAST / SLOW Over indication : OVER / UNDER Digital display : 4 digits Sampling rate : 2 times/second Power Supply : 4 x 1.5V AA battery or DC 6V 100mA (maximum DC9V) Power life : about 30 hours (alkaline battery) Operating environment : 0~40°C temperature / 10~85%RH humidity Storage environment : -10~40°C temperature / 0~70% RH humidity