The FORENSICS DETECTORS 4 Gas Meter is a reliable and accurate gas detector designed for confined space monitoring. It is capable of detecting a wide range of gases including O2, CO, H2S, and LEL with a quick response time of 30 seconds. The gas meter is powered by a long-lasting DC 3.7V Li-on battery with a 24 hours working battery time. It features a calibration standard of USA NIST Traceability and is certified with an ATEX explosion rating. The compact design and bright LED, buzzer, and vibration alarm make it easy to use and ensure safety in various industrial and commercial settings. Overall, this gas meter is a valuable tool for detecting hazardous gases in confined spaces.