hydrogen gas detector, meter & analyzer by forensics | usa nist calibration & certificate | dust & explosion proof | usb recharge | sound, light and vibration alarms | 0-1000 ppm | forensics detectors fd the professional h2 gas detector and meter by forensics. detect hydrogen gas for hydrogen vehicles, hydrogen fuel cells, hydrogen storage tanks or h2 gas in a laboratory setting. hydrogen is a colorless, odorless, and tasteless gas which makes it very important to adopt detection instrumentation for sensing. it is the lightest gas and is explosive in air at concentrations greater than about 4%. in contact with chlorine, oxygen, or other oxidizers, hydrogen is flammable and explosive and burns with a nearly invisible flame. the forensics h2 gas detector is very high precision for very accurate measurements and robust for field work, inspections, occupational safety, industrial and environmental. usa nist calibration. detection range of h2 is 0-1000ppm within 30 seconds with error less than +/- 5% full scale. comes factory calibrated. the detector has a dc3.7v li battery 1500mah that allows up to 24 hours of continuous use. advanced features such as temperature detection, alarm recording, alarm setting, backlight high resolution lcd, calibration features and others are all included. the product includes the gas detector, english manual, usb cable, charger and calibration cover. 100% customer satisfaction guaranteed. product quality checked and verified in california, usa. h2 detection: 0-1000ppm with 1ppm resolution. accuracy: ≤±5% f.s. response time: t<30s. indication: lcd indicates the time, concentration, temp, battery state. indication of alarm, fault and low voltage with led, sound, vibration. operating temperature: 0-122f. humidity: <95%rh non-condensing. operating voltage: dc3.7v li battery 1500mah. working time: >24hours. charging time: 4h. sensor life: 2-3 years. protection category: ip65. weight: about 130g (including battery). 100% customer satisfaction. 100% qa by real sensor and gas detector engineers. 100% product test and verification in california, usa! 100% quality guaranteed.