TES1355 RS-232 Datalogging Sound Level Tester   Noise Dose Meter                 Applicable standards     ANSI S1.25-1991, A weighting           Digital display     0~9999%DOSE           Criterion level     80, 84, 85, 90dB Selectable           Threshold level     Selectable from 70 to 90dB, 1dB step           Exchange rate     Selectable 3dB, 4dB, 5dB or 6dB           High level Detector     115dBA           Peak Flag     140dB           Measuring range     70-140dBA           Accuracy     ±1.5dB ref. 94dB @1KHz           Resolution     0.1dB           Frequency weighting     A           Time weighting     FAST , SLOW Selectable           Microphone     1/2 inch electret condenser microphone           Power supply     4pcs size AAA Alkaline Battery(not included package)           Battery life     About 36 hours           Dimensions     106(L)×64(W)×34(H)mm           Weight     approx. 350g (include batteries)           Accessories     Instruction manual, Software(1355), RS-232 Cable(1355) Carrying case,  Calibration Screwdriver,Windscreen.           Optional Sound level Calibrator     TES-1356 5 eveuts sturage for TES-1355 only