AUTOWN Compression Tester Kit 300 PSI Triple-Scale Gauge — 8-Piece Set with Gray Carry Case, Schrader Valve

AUTOWN's Professional Compression Tester Kit is a complete 8-piece diagnostic solution with a 0–300 PSI triple-scale gauge and portable case for testing gasoline engines in cars, trucks, ATVs, and small engines.

If you need a dependable way to check cylinder compression without guessing, this kit gives clear peak-pressure readings and the right adapters to fit common spark plug and small-engine ports. The integrated Schrader valve and quick-release safety feature streamline testing while the compact gray case keeps the tools organized for garage or roadside use. This product is intended only for gasoline engines and not for diesel or crude oil engines.

How does the triple-scale gauge simplify reading compression values?

The AUTOWN gauge displays pressure on three synchronized scales (PSI, BAR, kg/cm²) so you can read results in the unit you trust. The large dial and marked increments make peak pressures easier to spot at a glance, reducing interpretation errors when diagnosing ring or valve wear.

• 0–300 PSI primary scale for automotive standards
• 0–20 BAR and 0–21 kg/cm² secondary scales for metric convenience
• High-contrast markings for quick visual checks

What adapters and hoses are included to fit different engines?

The kit supplies four metal threaded adapters (M10, M12, M14, M18) plus straight and curved rubber cone adapters to match spark plug holes and small intake ports. An extension hose lets you reach recessed plugs or awkward angles, offering a practical fit across cars, motorcycles, ATVs and small engines.

• M10, M12, M14, M18 metal adapters for most spark plug threads
• Straight and curved rubber cone adapters for non-threaded ports
• Flexible extension hose for tight or recessed access

How does the kit protect users and keep readings stable?

The gauge includes an internal Schrader valve and a one-handed quick-release safety valve so you can depressurize without backflow or sudden bursts. The built-in Schrader valve also improves hose stability and prevents extra adapters, helping produce consistent peak pressure readings during tests.

• Integrated Schrader valve reduces loose connections and leaks
• One-handed quick-release valve for safe, controlled depressurization
• Durable metal fittings for leak-resistant connections

How portable and durable is the storage case for field use?

The compact gray carrying case is molded to secure every component, protecting metal adapters and the gauge from impacts and contamination. Its organized layout keeps parts accessible so you can move quickly between jobs or store the kit neatly in a home garage.

• Shock-resistant molded case with dedicated slots
• Lightweight and compact for easy transport
• Internal organization prevents lost parts and wear

Who is this for: The AUTOWN Professional Compression Tester Kit is built for mechanics, DIY enthusiasts, small-engine technicians, and anyone who needs reliable cylinder pressure checks on gasoline engines. It’s especially useful when diagnosing worn piston rings, valve sealing issues, or comparing cylinders during routine maintenance. Note: do not use on diesel or crude oil engines.