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Get automotive testing instruments from Grainger to help diagnose problems. A digital compression test kit contains the tools you need to test and record cylinder compression in gasoline and diesel engines. Find valve leaks, leaky intake manifolds, clogged mufflers and more with a cylinder leakage tester. Use a cooling system test kit to identify pressure and vacuum leaks, blown head gaskets, cracked blocks and more. Trust Grainger for the best in automotive testing instruments.Close

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