This meter is a combustible gases leakage detector, which is used to detect the leakage of combustible gases quickly and reliably. Convenient for users to safely detect and test a variety of combustible gases types, easyto meet different test needs. Two models are available, you can choose HT59 or HT60 according to your needs, HT59 without display, HT60 with LCD display. Widely used, suitable for water heating device detection, gases pipeline detection, etc.Specifications:Name: Combustible Gases DetectorMaterial: plasticsBattery: 2* 1.5V AAA Alkaline Battery (not included)Display: HT59 concentration bar indicator; HT60 LCD displyTest ranges: 50-1000ppmDetecting gases: combustible gasesAccuracy: 10% FS(methane)Sensitivity: <50ppm(methane)Response time: <2 secWarm-Up time: Approx. 30 secAlarm mode: visible and audibleAuto power off: YesLow battery indication: YesTest Gases(partial list): acetone, Acetylene, alcohol, ammonia, benzene, , ethanol, oxirane, gasoline, hexane, hydrogen, methane, naphtha, natural gases, paint thinners, propane, solvents, etc..Reactions time: 500PPM: Approx. 5sec; >500PPM: Approx. 2secOperating conditions: 0 to 50 / 20%RH to 80%RHStorage conditions: -10 to 60 / 20%RH to 80%RHItem size:HT59: 155* 28* 23mm/ 6.10* 1.10* 0.91inHT60: 166* 28* 23mm/ 6.54* 1.10* 0.91inItem weight: 36g/ 1.27ouncePackage size:HT59: 160* 44* 28mm/ 6.30* 1.73* 1.10inHT60: 171* 44* 28mm/ 6.73* 1.73* 1.10inPackage weight: 77g/ 2.72ouncePacking List:1* Combustible Gases Detector1* Guideline