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, compact, portable and easy to carry, durable for long time use. 4. Wide application, suitable for industrial noise, traffic 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 Meter Model: HT622B Display:LCD Display Measurement Range 30-130dBA, 30-130dBC Frequency:30HZ-8KHZ Resolution:0.1dB Accuracy:1.5dB(94dB at 1kHZ) 5dB(94dB at 8kHZ) Frequency Weighting:A Weighting, C Weighting Time Weighting:Fast: 125mS, Slow: 1s Microphone:Electret Capacitance Working Environment:0-40, Less than 80%RH Storage Environment:-10~50, Less than 80%RH Automatic Power Off:10 Minutes Power 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 in Material: ABS colour: Red+black Package Contents: 1 x Sound Level Meter (Battery Not Included) 1 x Chinese and English Manual 1 x Bag Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.