Fangrui Product Details 1. Ht-80a Small Lcd Digital Display Noise Tester Portable Precision Noise Meter 2. Features: 3. Sensitive Sensor With A Response Time Of 0.5 Seconds, No Contact Required. It Can Measure Noise Levels In Any Situation And Quickly Display Accurate Measurement Results. 4. Large And Clear Lcd Backlit Display, Convenient Reading At Night. Low Radiation, Reduce Damage To Eyes. 5. Measuring Range 30-130dba; +-1.5db Accuracy, 0.1db Resolution. 6. Data Hold Function; Maximumminimum Sound Level Measurement; Automatic Shutdown After 15 Minutes, And Also Has An Alarm Function When The Voice Level Reaches 130db. 7. Suitable For Factories, Offices, Homes, Schools And Construction Sites. 8. Product Parameters: 9. Frequency Range: 31.5hz-4kh, Range: 40-130db 10. Accuracy: -+3.5db (at 94db, 1khz Reference Conditions), Resolution: 0.1db 11. Sound Level Frequency Weighting: A Sound Level Frequency Weighting 12. Microphone: 12 Inch Polarized Condenser Microphone 13. Display: Lcd Display 14. Display Digits: 3-12 Digits 15. Response Speed: 0.5 Seconds 16. Time Level: Fast Response (125ms) 17. Alarm Function: "ol" Will Be Displayed When The Input Exceeds The Range 18. Automatic Shutdown: Automatically Shut Down After 15 Minutes Of No Operation 19. Battery: 9v Carbon Battery X 2 (battery Is Not Included In The Shipment) 20. Operating Temperature: 0 To 40 Degrees Celsius (32 To 140 Degrees Fahrenheit) 21. Operating Humidity: 10 To Rh 22. Storage Temperature: -10 To 60 Degrees Celsius (14 To 140 Degrees Fahrenheit) 23. Storage Humidity: 10 To Rh 24. Dimensions: 170 X 58 X 35mm 25. Weight: 107g