Mityvac Professional Compression Test Kit performs dry and wet engine cylinder compression tests that are used to detect ring or cylinder head problems, sticking valves, blown head gasket(s), and more. Furthermore, the durable and sturdy material offers longevity. Simple design makes it easy to use. Kit features grade threaded adapters for leak-proof seals, hoses for hard to reach applications, and easy to read 2-3/4 in. (70 mm) Dia gauge. Kit includes 2-3/4 in. (70 mm) gauge with high impact lens, rubber boot, and 4 scales of measure (psi, kg/sq.cm, bar, kPa), attached to 10 in. (250 mm) L hose and quick release coupler, 14 mm short-thread adapter with 6-1/2 in. (165 mm) and 12 in. (305 mm) L hoses, 14 mm long-thread adapter with 12 in. (305 mm) L hose, 18 mm short-thread adapter with 12 in. (305 mm) L hose, 14 mm short-thread x 18 mm long-thread adapter, 10 mm thread small engine adapter, 12 mm thread small engine adapter, quick release air hold adapter, custom blow-molded case, field service kit, and user manual (English/Spanish/French). Material: Metal.