Mini Sound Level Meter DT-85A/85C Mini Sound level meter have a wide dynamic range from 35 to 130dB. They have different frequency weighting A and C to respond to human sense or machine monitoring purposes. This Sound Level Meter has been designed to meet the measurement requirements of safety Engineers,Health,Industrial safety offices and sound quality control in various environments. Ranges from 40dB to 130dB at frequencies between 31.5Hz and 8 KHz. Display with 0.1dB steps on a 4-digits LCD. With one equivalent weighted sound pressure level A. Specifications: Function Range Accuracy DT-85A DT-85C Sound Level 35-130 dB 3.0 dB((ref94dB@1kHz)) * * Frequency 31.5-8kHz * * Frequency Weighting A C Microphone : 1/2 inch electret condenser microphone Display : LCD Digital display : 4 digits Resolution: 0.1dB Display Up data: 0.5 sec. Time weighting : FAST(125mS) Accuracy : + 3.5dB @1kHz,94dB(under reference conditions) Alarm function : "OVER" is show when input is out of range(>130dB) Auto power off : Meter automatically shuts down after approx. 15 minutes of inactivity. Power supply : One 9V battery,006P or IEC 6F22 or NEDA 1604. Operation temperature : 0 to 40& 8451;(32 to 104oF) Operation humidity : 10 to 90%RH Storage temperature : -10 to 60& 8451;( 14 to 140 oF) Storage humidity : 10 to 75%RH Size(HxWxD): 65 x 26x 16mm Weight: 80g Accessories :9V battery,Clamshell,User manual