Premium Compression Test Set – 300 PSI / 20 BAR Gauge, 25" Extension Hose, Quick-Connect Adapters

Accurately evaluate engine cylinder compression with the Milton® S-1258 Premium Compression Test Set, designed for automotive technicians and service professionals who need a reliable way to identify potential engine performance issues.

The easy-to-read analog pressure gauge accurately measures cylinder compression from 0–300 PSI (0–20 BAR), helping technicians identify compression differences that may indicate worn piston rings, leaking valves, head gasket issues, or other internal engine problems. A rubberized gauge protector helps guard against bumps and impacts during everyday shop use, while the included 25-inch extension hose provides added reach when accessing difficult or recessed spark plug locations.

Designed to accommodate both small and large engines, the set includes a selection of specialized connectors and adapters for greater application coverage. Quick-connect couplers allow components to be connected and disconnected efficiently, helping streamline compression testing when moving between cylinders or engine applications.

An integrated push-button pressure release makes it easy to reset the gauge between tests, while additional O-rings and Schrader valves are included to support maintenance and extend the service life of the kit.

Whether diagnosing poor engine performance, checking cylinder-to-cylinder compression, or troubleshooting potential internal engine problems, the Milton® S-1258 provides the components needed for efficient, repeatable compression testing.

Ideal Applications

Designed for automotive service technicians, repair facilities, fleet maintenance operations, engine builders, and serious DIY users, the Milton® S-1258 Premium Compression Test Set is ideal for cylinder compression testing, engine troubleshooting, preventative maintenance, and diagnosing potential internal engine problems.