Set includes: special tube made of PVC, 500ml reaction fluid (enough for about 100 tests), pump to suck gas from the cooling system, tube for measuring the tightness, user manual. Application If you suspect that the head gasket or the head itself is damaged, you can perform a verification test yourself. The tester is suitable for liquid-cooled combustion engines (gasoline, diesel, LPG). In the case of a damaged head gasket or cylinder head gasket, some of the exhaust gases, including CO2, are sent to the cooling system. The principle of operation of Device is based on measuring the concentration of CO2 - in the case of an increased concentration, the reaction fluid reacts with CO2 and changes its color. It can be used in: motorcycles, excavators, agricultural machines, aggregates.