Description Features:Compact structure and light weight, portable to use and store, providing you a better using experience.Adopts high precision sensor for fast response (2 second) and accuracy detection (10%F.S.).High-definition LCD display for clear and easy reading, HT601 supports digital bargraph display and HT601A supports bargraph display.Dual-way alarm including sound alarm and bargraph alarm for timely feedback on the results.Powered by 3 * AAA battery (NOT included), with low battery indication, long standby and easy for replacement.Gas detected (partial listing): Acetone, Acetylene, Alcohol, Ammonia, Benzene, Butane, Ethanol, Ethylene, Oxide, Gasoline, Hexane, Hydrogen, Methane, Naphtha, Natural Gas, Paint Thinners, Propane, Solvents, etc.Specifications:Model: HT601 / HT601A (Optional)Material: ABSColor: BlackPower Supply: 3 * 1.5V AAA battery (NOT included)Range:HT601: 0~9999ppm/0.00~20.00%LELHT601A: Bargraph DisplayAccuracy: 10% FS (Methane)Sensitivity: 50ppm (Methane)Response Time: 2 secWarm Up Time: Approx. 30 sec.Display:HT601: Digital BargraphHT601A: Bargraph DisplayAlarm Mode: Visible AudibleAuto/Manual Zero:HT601: Auto ManualHT601A: AutoUnit Change: only HT601 supportAmbient Temperature: only HT601 supportAlarm ON/OFF: Auto Power OFF: Low Battery Indication: Flexible Probe: Approx. 43.5cm / 17.13inItem Size: Approx. 15.3*5.8*3cm / 6.02*2.28*1.18inItem Weight: Approx. 235g / 8.29ozPackage Size: Approx. 28*11.5*4.5cm / 11.02*4.53*1.77inPackage Weight: Approx. 381g / 13.44ozPacking List:1 * Gas Analyzer1 * Storage Pouch1 * User Manual (English)