Feature:1. With portable design, anti-drop, anti-skid, and anti-static design, suitable for single hand operating with a comfortable feeling.2. Featuring large LCD display screen, cool and modernized design, simple to operate and easy to read even in the dark.3. It is lightweight, compact, ergonomic, user-friendly and ideal for monitoring noise levels.4. It will automatic shutdown after no operation within 30min to ensure the battery service life and also features data hold, maximum and mumimum data display.5. It is widely used to measure the sound level of rooms, subways, libraries, business centers, offices, homes, etc.Specification:Condition: 100% Brand NewItem Type: Noise TesterMaterial: 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 Package List:1 x Noise Tester1 x