ET-953 LCD Digital Sound Level Meter Noise Detect Tester Data Decibel Measurement 30-130dB Condition: Item Type: Noise Tester Material: ABS Applicable Standard IEC61672-1 2 Accuracy ±1.4db Frequency Range 31.5Hz-8kHz Dynamic Range 50db Measuring Range Low Frequency: 30dB〜80dB Middle Frequency: 50dB〜100dB High Frequency: 80dB〜130dB Auto Range: 30dB-130dB Frequency Weighting A＆C Time-weighted Fast 125ms; Slow(1s) Microphone 1/2in Electret Condenser Microphone Display 4digits LCD display, resolution 0.1dB Sampling Time 2times/s Maximum Maximum  Data Minimum Hold Minimum  Hold Reading Hold Alarm Function Enter "OVER" when the input is less than "UNDER". Analog Output AC/DC output of headphone socket             AC = 1Vrms, DC = 10mV / dB Auto Power -Off The meter will turn off automatically after about 30 minutes. 15 minutes of inactivity. Power Supply 9V Battery, 006P or IEC 6F22 or NEDA 1604 (not included) Battery Life ≥ 30h Operating Condition   -20℃-60℃; 10％RH-90％RH Storage Condition  -20℃-60℃; 10％RH-75％RH Size: (LxWxH) 252x66x33mm / 9.9x2.6x1.3in Weight 1270g / 2.8lb