HABOTEST HT622B Decibel Meter Professional Digital Sound Meter Noise Tester
Model:HT622A HT622B optional. HT622B How to Use USB Data Logger Accuracy: ±1.5dB (standard sound pressure, 94dB at 1KHz), ± 5dB (standard sound pressure, 94dB at 8KHz). We are helpful and will solve the problems.