Combustible gas tester reaction time: 2 seconds Warm-up time: about 60 seconds (25 ℃ sound level measurement range, 60% RH environment) Continuous working time: 8 hours (with a slight change in working condition) Low power indication: 3 ± 0.2V Operating Temperature: 0 ~ 52 ℃ control probe reset function can detect power indicator, alarm indicator function Power: 3 * 1.5V LR14 batteries Dimensions: 76 * 49 * 220MM TEUs Quantity: 20PCS Standard Carton Size: 51.1 * 37.4 * 28.5CM TEUs GW: 14.4KG aneroid barometer DYM3 use: 1, please aneroid barometer horizontal use. 2, reading with your fingers gently knock the instrument housing deduction or glass surface precision sound level meter to eliminate the transmission mechanism of friction. 3, when viewed with a mirror-pointer pointers overlap sound level meter, then the pointer value is the number represents the value of barometric pressure readings accurate to one decimal place. 4, read the temperature represents the value of the barometer, accurate to one decimal place. 5, find the value of the number of pressure: pressure represents the value read on the instrument only after these revisions before using. Sound level meter measuring range, Jinke instrumentation (certified), the sound level meter is provided by Qingdao Branch of the Instrument Co., Ltd. Qingdao Branch of the Instrument Co., Ltd. (www.qdjk17.com) is Qingdao, a leader in analytical instruments, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Branch of the Instrument in leadership with the staff warmly welcome all inquiries negotiations to create Branch instrumentation a better future.