Fangrui Product Details 1. Sndway Handheld High Precision Noise Decibel Meter 2. Accuracy: +-1.5db(based On The Standard Sound Source 94db@1khz) 3. Frequency Response Range: 31.5hz8.5khz 4. Dynamic State Range: 50db 5. Measuring Range: 30~130dba35~130dbc 6. Frequency Weighting Character : A Weight And C Weight 7. Numerical Digit Display: 4 Digits,resolution 0.1db, Sampling Frequency 2 Timessecond 8. Dynamic Scale Display: 1 Scale Equals 2db Or 1db, Sampling Frequency 2 Timessecond 9. Dynamic Scale Shift: 30~130db, 30~80db, 50~100db, 80~130db 10. Overload Display: "over"and"under In Display Screen 11. Ac Signal Output: 0.65vrms For Each Shift And Full Scale, The Output Of Impedance Around 600ohm 12. Dc Signal Output: 10mvdb, The Output Of Impendance Around 100ohm 13. Dynamic Character: Two Choices Of Reaction Rate "fast" And "slow" 14. Microphone: 6mm Capacitor Microphone 15. Max Locking: Max 16. Battery: 3×1.5v Aaa (not Included) 17. Working Temperature And Humidity : 0 C~40c Rh 18. Storage Temperature And Humidity: -10c~60c, ~rh