AUTOWN Compression Tester Kit — 13-Piece, 0-300 PSI Fluorescent Gauge with Spark Plug Testers

AUTOWN's Professional Compression Tester Kit is a 13-piece diagnostic set with a high-visibility fluorescent 0–300 PSI triple-scale gauge, five metal adapters, two spark plug testers, and a quick-release valve for accurate gasoline engine pressure testing.

When you need fast, reliable cylinder compression readings on gasoline-powered vehicles and small engines, the AUTOWN kit packages professional features into a compact carrying case. The bright fluorescent dial and built-in Schrader valve make readings easier and more stable, while the included adapters and spark plug testers let you service cars, trucks, ATVs and many small gas engines without hunting for extra fittings.

How accurate and readable are the pressure readings?

The gauge delivers peak pressure readings up to 300 PSI, shown on three scales (PSI, Bar, kg/cm²) for easy interpretation. Its fluorescent face improves contrast in dim workspaces, helping you spot small differences between cylinders.

• Triple-scale dial: 0–300 PSI, 0–20 Bar, 0–21 kg/cm²
• High-visibility fluorescent background for low-light use
• Built-in Schrader valve for stable, consistent measurements
• Sturdy mechanical gauge movement for reliable peak hold

What components are included and how do I use them?

The kit contains five screw-in metal adapters (M10–M18), an extension hose, two spark plug testers, and a protective case, enabling quick setup across a broad range of gasoline engines. Attach the correct adapter to the spark plug hole, connect the hose to the gauge, crank the engine per instructions, then read the peak pressure.

• Five metal adapters covering common spark plug thread sizes (M10–M18)
• Extension hose for hard-to-reach cylinders and angled access
• Two spark plug testers to confirm ignition issues separately
• Durable carry case to store adapters, hose and gauge securely

Is the AUTOWN tester safe and user-friendly?

Safety and convenience are built in: the quick-release valve lets you bleed pressure with one hand after testing, reducing risk, and the integrated Schrader valve removes the need for separate adapters. The metal adapters and hose fittings are designed for solid connections that resist leaks while testing.

• Quick-release safety valve for controlled pressure release
• Integrated Schrader valve eliminates extra adapter requirements
• Robust metal adapters minimize thread wear and sealing issues
• Compact layout and labeled parts for straightforward operation

What engines are compatible and what should I avoid?

This compression set is made specifically for gasoline engines found in cars, light trucks, ATVs and many small gas-powered tools and engines. It is not designed for diesel engines, two-stroke crude oil systems, or applications requiring diesel-rated fittings and pressure ranges.

• Designed for gasoline automotive and small engine use
• Works with spark-ignition cylinders where spark plug threads are accessible
• Not suitable for diesel engines or crude oil engine systems
• Verify adapter fit and follow engine manufacturer testing procedure

Who is this for: Mechanics, home DIYers, restoration hobbyists and service technicians who need a dependable, portable cylinder compression solution for gasoline engines. If you perform routine engine diagnostics, troubleshooting for worn rings or valve sealing problems, or need a bright, easy-to-read gauge while working in a garage or on the road, the AUTOWN 13-piece kit supplies the fittings and features to get repeatable readings without extra adapters.