Feature:1. Using high‑sensitivity sensor, quick response and high measurement accuracy.2. Hand‑held sound level meter, compact and light, suitable for field measurement.3. Support backlight display, can easily read measurement data in strong light and night.4. Equipped with condenser microphone, convenient measurement and simple operation.5. It can measure and monitor the sound quality, suitable for homes, residential areas, schools, etc.Specification:.Condition: 100% Brand NewItem Type: Sound Level MeterMaterial: PlasticModel: HT622Type: HT622A, HT622B (Optional)Battery: 3 x AAA Battery (Battery Not Included)Product Size: Approx. 189x60x33mm / 7.4x2.4x1.3in Type (Optional)HT622A HT622BSound Pressure Accuracy±1.5dB (standard sound pressure, 94dB at 1KHz), ± 5dB (standard sound pressure, 94dB at 8KHz)±1.5dB (standard sound pressure, 94dB at 1KHz), ± 5dB (standard sound pressure, 94dB at 8KHz)Sound Pressure Frequency Response30Hz-8KHz30Hz-8KHzSound Pressure Dynamic Range50dB (each measurement gear)50dB (each measurement gear)Sound Pressure Measurement Range30-130dBA, 35-130dBC30-130dBASound Pressure Frequency Weighted CharacteristicsA weightedA and C weightedSound Pressure Dynamic CharacteristicsFATS 125ms, SLOW 1secFATS 125ms, SLOW 1secMicrophonePolarized condenser microphonePolarized condenser microphoneMeasuring Range30-80dB, 40-90dB, 50-100dB, 60-110dB, 70-120dB, 80-130dB30-130dB.Package List:1 x Sound Level Meter (Battery Not Included)1 x Storage Bag1 x ManualNote:1.Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding.2.Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.