The TracerlinePRO-Chek CG Combustible Gas LeakDetector, No. TP-9363, finds leaks in CNG vehicles, acetylene welding tanks, propane tanks and more. It also detects gasoline, methanol, ethanol, methane, ethane, butane and other dangerous gases. The PRO-Chek CG features a three-position switch with a sensitivity slide that helps pinpoint the location of each leak quickly. Additional features include an audible alarm and yellow LED to determine the size of the leak, and an auto-zero function that blocks out background gas levels. The detector’s chrome-plated, flexible metal probe holds its position in tight areas, while the field-replaceable sensor and batteries eliminate downtime. The diagnostic tool comes complete with sensor, two D batteries and a carrying case.