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GM1351 30-130dB Digital Sound Level Meter Meters Noise Tester In Decibels LCD. This equipment has been designed to meet the measurement requirement of Safety Engineers, Health, Industrial Safety offices and Sound Quality control in various environment, which include factory, office, traffic. Measuring range 30dBA~130dBA Accuracy ± 1.5 dB (94dB@1KHz Frequency range 31.5Hz~8KHz Frequency weighting A Digital Display 4digits Resolution 0.1dB Sample rate 2 times/second Microphone 1/2 inch electret condenser microphone Power supply 9V Battery Power life About 30 hours (alkaline battery) Operating condition 0~40??10~80%RH Storage condition -10~60??10~70%RH Weight 144g (including battery) Dimension 57*26*149mm.