Description： Fast, economical and accurate method to test for combustion gas leaks Sure diagnosis within a few minutes Positive proof that a leak is present when the tester fluid changes colour on detection of CO₂ gas - if there is a hairline crack in the cylinder head, engine block or damage to the cylinder head gasket, the test fluid turns yellow. Ideal for routine checks and scheduled maintenance work Ideal for engine checks on used cars Specifications: Volume: 30ml Material: Plastic Size : 5.5*17CM Color: White Package Included: 1X combustion leak detector（Tester fluid not contain）