Proto® Compression Test Gauge Kit, Inch/Metric Measuring System, 300 psi, Dial Display, 2-1/2 in Dia x 10-29/32 in L, Spark Plug Thread Connector
- 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
- Equipped with neoprene o-rings for positive finger-tight seal
- Spark plug thread
- Includes compression gauge, O-ring, compression gauge and instructional pamphlet