WINTACT WT8822 Hydrogen Sulfide Detector Independent H2S Gas Sensor Warning-up High Sensitive Poisoning Alarm Detector

feature 1.HOLD data retention 2.MAX maximum / MIN minimum 3.UN VOL, UNIT switch unit in PPM, (MG / M ^ 3) 4. Alarm settings 5. Calibration 6. On/Off (timed shutdown) Package Included 1 x hydrogen sulfide detector (without battery) 1 x manual