Feature: 1. Capacitance microphone and metal housing, safe to use, A/C weighting measurement is more professional.2. LCD display screen with backlight makes the data reading clearer and more convenient at night.3. Comes with a storage bag, , portable and easy to carry, durable for long time use.4. Wide application, suitable for industrial noise, road, school, car inspection, sound, , etc.5. The operation is simple and convenient, light weight, small size and practical to use.Specification:Condition: Item Type: Sound Level MeterModel: HT622BDisplay:LCD DisplayMeasurement Range 30-130dBA, 30-130dBCFrequency:30HZ-8KHZResolution:0.1dBAccuracy:1.5dB(94dB at 1kHZ)5dB(94dB at 8kHZ)Frequency Weighting:A Weighting, C WeightingTime Weighting:Fast: 125mS, Slow: 1sMicrophone:Electret CapacitanceWorking Environment:0-40, Less than 80%RHStorage Environment:-10~50, Less than 80%RHAutomatic Power Off:10 MinutesPower Supply:3 x 1.5V AAA (LR03) Battery (Not Included)Product Size . 190 x 60 x 30 mm / 7.5 x 2.4 x 1.2 inMaterial: ABScolour: Red+blackPackage Contents:1 x Sound Level Meter (Battery Not Included)1 x Chinese and English Manual1 x BagOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.