Proto JCTR10 2-1/2 Diameter Flexible Psi/Metric Compression Gauge
•Includes compression gauge, O-ring, compression gauge and instructional pamphlet. •Flexible hose and quick-disconnect coupler permit fast, easy engagement of threaded fitting into spark plug hole. •Gauge has convenient side release valve and dual reading scale for both psi and metric values (0 to 300 psi, 0 to 20 kg/cm2). •Equipped with neoprene "O" rings for positive finger-tight seal. •Includes adapters for regular 18mm spark plugs and for regular and long 14mm spark plugs.