Brand new and Sealed. See pictures for full descriptions. Sold as pictured. Very Easy To Use The professional hydrogen (H2) gas meter by FORENSICS. Detecting hydrogen gas in vehicles, fuel cells, storage tanks, laboratory settings, or outgassing from batteries. H2 is a colorless, odorless, and tasteless gas which makes it very important to adopt detection instrumentation. It is the lightest gas and explosive in the air over 4%. When in contact with chlorine, oxygen, or other oxidizers, hydrogen is flammable and burns with a nearly invisible flame. Our H2 gas detector has high precision and provides robust measurements for fieldwork, inspections, occupational safety, industrial, and environmental applications. The instrument employs a high-quality electrochemical sensor. USA NIST Traceable Source Calibration Have the highest confidence in your gas detection accuracy. Possible only with best calibration practices to USA NIST Traceable Sources. Calibration qualified in the Forensics Detectors laboratory, located in Los Angeles, California, USA. How Is Hydrogen (H2) Gas Detected? A Hydrogen (H2) gas detector is composed of electronics and an H2 sensor. The hydrogen gas sensor converts the detected hydrogen gas concentration to an electronic signal for analysis by the onboard microprocessor. From there, the processor outputs the reading to the display. If the measured amount of H2 exceeds the pre-set values, alarms will be triggered to warn the user. Included Hydrogen Detector Belt Clip Sling English Manual USB Charging Cable Calibration Cover USA NIST Calibration Certificate Consider pictures as a part of the description and judge any and all cosmetic or other issues to your opinion before purchasing. PLEASE NOTE THE PICTURE IS THE ACTUAL ITEM, YOU WILL RECEIVE. We do our best to accurately picture and describe each and every one of our listings. Inevitably, you may receive an item that does not meet your expectations. It is no way our intention to mislead or cheat any customer. If you have any issues with your purchase, please message us before filing a refund request. Please note that all refund requests will require the return of the item in the same condition as it was sent. Any damage or material change to the condition of the item may result in a reduced refund, up to 50% in accordance with policy. All refunds on returns will be processed minus the original shipping charges that were incurred to ship it to you. We package our items in the most cost/time-effective way to provide competitive pricing. Should you require special shipping considerations (e.g. packaging or shipping timelines), please message us PRIOR to purchasing so we can work towards an amicable solution. Certain requests may incur additional charges. Post-purchase shipping demands will not be honored.