4 Gas Monitor by Forensics | Built-in Pump Multi Gas Meter | O2, CO, H2S, LEL | Color Display & Graphing | USA NIST Calibration | Computer Data Logging | is up for auction in Industrial & Scientific. The current bid is $105.50, 82% below the $598.45 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.