Sound Level Meter 9.6inch LCD Screen 30‑130dB Wall Mount Noise Decibel Reader✈
Usually in a very quiet room, this value will not fall below 40dB, which is normal. Accuracy: ±1.5dB (Based on Standard Sound Source, 94dB 1KHz). Storage Temperature and Humidity: -10~60℃, 10%~70%RH.