Snap-on's Compression Tester Gauge Set, No. MT308L comes designed for use on spark ignited engines that do not exceed 250 psi of compression. It maintains the highest compression test reading and resets to zero with a push-button release valve. Its ruggedized boot resists abrasion that can occur in an underhood environment. Its standard reach adapter connects to standard length spark plug threads and its long reach adapter connects to extra long spark plug threads. The set's quick coupler connections between hose and gauge make for easier use.
