Ideal for testing vacuum lines and components. Accurately tests low pressure fuel systems. Quickly diagnose internal engine problems such as bad rings, valves and leaking head gaskets. Kit comes complete with adapter for most applications. Pin point hard to find problems such as cracked lines. Large 3-1/2" gauge features a chrome bezel and rugged protective outer boot. Dual purpose gauge reads vacuum and pressure. Dual scale gauge reads 0-30 in. Hg vac and 0-70 cm Hg, also reads 0-15 psi and 0-100 kPa.