Sound Level Meter 30‑130dB Noise Detector 18in LCD Display Decibel Tester AC Item Type: Sound Level Meter Measuring Range: 30~130dB Accuracy: ± 1.5dB, subject to standard sound source, 94dB at 1KHz. Frequency Response: 31.5Hz ~ 8.5KHz Frequency Weight: A Weight Response Time: Fast Microphone: 6mm condenser microphone. Digital Display: 3 Digits Resolution: 0.1dB at 30-99.9 or 1dB at 100-130. Alarm Prompt: Supported Alarm Output: Supported Storage Function: Not Supported Communication with Computer: Not Supported Display Screen: 18in Power Supply Mode: DC 5V 2A power adapter, DC 5.5 x 2.5 interface. Working Temperature and Humidity: 0 ~ 40℃, 10%~80%RH Storage Temperature and Humidity: -10 ~ 60℃, 10%~70%RH