30-130dB HT602A Noise Meter Sound Level Meter Handheld DB Meter with Temperature Humidity Meter Auto Power Off with Backlight s: & 9679;Digital Sound Level meter, noise meter. Site Noise Measurement, Factory Noise Measurement, Engine Noise measurement & 9679;Large screen digital display. & 9679;Multiple functions are measured in real time. & 9679;LCD HD backlight digital display. & 9679;Polarized capacitive microphone. Short response time, strong anti-interference ability, more accurate data acquisition. & 9679;Fast/slow dual measurement modes: FAST/SLOW time input, one-key switch Specifications Range: 30-130dBA Accuracy: 1.5dB(94dB@1KHz), 5dB(94dB@8KHz) frequency response: 30Hz-8KHz Frequency weighting: A Time weight: FAST 125ms, SLOW 1sec Microphone: Polarized capacitance microphone Temperature: -20& 8451;~60& 8451;(-4& 8457;~140& 8457;)/1.5& 8451; Humidity: 0~100% /5.0% Bargraph: Yes Data hold: Yes Backlight: Yes MAX/MIN hold: Yes Auto Power Off: Yes Low battery indication: Yes Battery Type: DC 1.5V 3*AAA(Not included) Size: 142x58mm Package List: 1 * HT602A Noise Meter 1 * User manual