INNOVA 3614 Compression Tester Plus - 6 Piece Kit Designed to perform compression tests to help identify damaged pistons, worn rings, burnt valves, and blown head gaskets Side-release valve allows repeated tests without disconnecting the hose Includes 15-inch rubber hose with stainless steel casing, 10mm, 12mm, 14mm, and 18mm adapters Also Includes 14mm long reach adapter for long reach spark plug applications Large, easy-to-read 2-1/2-inch dial face with dual-calibrated and color-coded scales