?wintact Wintact 4 in 1 Gas Leak Detector, Monitor Multi Gas Alarm Sniffers Combustible, Natural, Methane, Propane, Carbon Monoxide, Hydrogen Sulfide, Oxygen for Home, RV, Sewer WT8811 is up for auction in Industrial & Scientific. The current bid is $2.50, 99% below the $198.99 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.