AUTOWN Compression Tester Kit — 300 PSI Triple-Scale Gauge, 8-Piece Set with Gray Carry Case for Cars, Trucks & ATVs

AUTOWN's Professional Compression Tester Kit is an 8-piece diagnostic set with a 300 PSI triple-scale gauge and portable case, built to measure peak cylinder compression on gasoline engines accurately.

This compact kit provides a reliable way to check engine compression for cars, trucks, ATVs and other small gasoline engines so you can spot worn rings, leaking valves, or head gasket issues before they escalate. The gauge displays readings in PSI, BAR and kg/cm², while the metal and rubber adapters fit common spark plug openings. Everything packs into a shock-resistant gray case for transport and storage.

How does the triple-scale gauge make readings easier?

The gauge shows three measurement systems on a single dial—0–300 PSI, 0–20 BAR, and 0–21 kg/cm²—so you can read results in whatever unit your workflow or manual requires. The clear dial and sturdy pointer reduce parallax and provide dependable peak pressure readings taken at cranking speed. A built-in Schrader valve inside the gauge eliminates the need for an external valve adapter, improving stability during testing.

• 0–300 PSI, 0–20 BAR, 0–21 kg/cm² readable on one dial
• Robust needle and clear face for quick visual checks
• Internal Schrader valve for steady, repeatable results

What adapters and accessories are included for different engines?

The kit includes four threaded metal adapters (M10, M12, M14, M18) to match common spark plug sizes, plus straight and curved rubber cone adapters for sealing odd-shaped or shallow spark plug holes. An extension hose gives extra reach for recessed plugs or tightly packed engine bays, making this set useful across many gasoline engines. All pieces are organized in a foam-cut gray carrying case.

• M10, M12, M14, M18 metal threaded adapters for standard plugs
• Straight and curved rubber cone adapters for irregular openings
• Flexible extension hose for deep or tight spark plug wells
• Shock-resistant case with molded compartments for each part

Is the kit safe and simple to operate on a workbench or roadside?

Safety features include a quick-release one-handed valve on the gauge that lets you bleed pressure smoothly after each test, preventing sudden depressurization. The kit is designed for straightforward, repeatable testing—remove the spark plug, screw in the correct adapter, crank the engine, read peak pressure, and release. Because the kit is intended for gasoline engines only, avoid using it on diesels or other incompatible machinery.

• Quick-release safety valve for controlled depressurization
• Step-by-step testing workflow for repeatable readings
• Not suitable for diesel engines—gasoline engines only

How portable and durable is the AUTOWN compression tester kit?

The kit stores neatly in a compact gray case designed to resist shocks and keep each adapter secured during transport. The metal adapters and reinforced hose are built for workshop use, while the case fits easily in a toolbox or vehicle trunk for mobile diagnostics. The layout keeps parts visible and prevents loss, making routine inspections faster at the shop or on the road.

• Shock-resistant gray storage case with custom foam layout
• Compact footprint for easy storage in toolboxes or trunks
• Durable metal adapters and reinforced hose for repeated use

Who is this for: Mechanics, fleet technicians, weekend DIYers, and ATV or small-engine owners who need a portable, professional-grade compression tester for gasoline engines. If you want accurate, repeatable peak pressure checks with multiple adapters and the convenience of a single triple-scale gauge in a transport-ready case, this AUTOWN kit covers the essentials for routine compression diagnosis.