Diagnose blown gaskets, cracked blocks and cylinder heads on both petrol and diesel vehicles. Checks for CO2 in cooling system and indicates its presence by test fluid colour change visible in the premium quality chamber. Use with cone adaptor or in conjunction with radiator caps from Model No's VS001, VS0011, VS0013, VS0014, VS0033 and VS006. For Test Fluid Refill order Model No. VS0061F.