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Engine Cylinders Compression Gauge Diagnostic Tester Features: 2 rubber cones ends for quick check (no need to thread into head) 3" Gauge has dual color scale with 0-300 PSI, 0-20 kPa Gauge will hold pressure values and has quick push button release valve Fittings: M10, M12, M14, M18 (Male, With "O" Ring) Includes 14mm and 18mm spark plug adapters Comes with 1/2" diameter x 14" extension hose, straight and angled fittings, rubberized gauge protector and a blow mold case. Package Includes: 2x rubber cones ends 1x 3" Gauge has dual color scale with 0-300 PSI, 0-20 kPa 4x Fittings M10, M12, M14, M18 (Male, With "O" Ring) 1x with 1/2" diameter x 14" extension hose Order Info: M10*1.0 adapter M12*1.25 adapter M14*1.25 adapter M18* 1.5 adapter