Prokomon Petrol/Gasoline Engine Compression Tester Kit — 300 PSI Gauge, M10–M18 Adapters & Extensions

This compression tester kit gives clear, repeatable cylinder pressure readings so you can diagnose common petrol engine problems without guesswork. The kit combines a large, easy-to-read analog gauge with multiple threaded adapters, metal extension pieces and a flexible hose to reach deep or awkward spark plug holes. It's designed for hobbyists, mechanics and fleet operators who need reliable pressure checks on cars, motorcycles, lawn mowers, ATVs and other petrol-powered equipment (not for diesel engines).

How does this tester help find engine issues?

Measuring static compression in each cylinder reveals leaks and mechanical wear that affect performance. Low or uneven readings point to valve sealing problems, worn rings, head gasket failure or piston damage, helping you target repairs faster.

• Detects stuck or leaking valves and worn piston rings
• Identifies cracked heads and blown head gaskets by comparing cylinder-to-cylinder values
• Finds carbon build-up or burned pistons via reduced compression numbers
• Helps decide if further tests (leak-down) are needed

What components are included and why they matter?

The kit contains a spring-buckle pressure gauge, five threaded adapters (M10–M18), metal extension pieces and a flexible hose so you can adapt to most petrol engine spark plug configurations. Each part is chosen to give a secure seal and consistent readings even in deep spark plug wells.

• Spring-buckle pressure gauge rated to 300 PSI / 20 BAR for a wide range of petrol engines
• Adapters M10, M12, M14, M16, M18 cover most small and automotive spark plug threads
• 200 mm metal extension and two 50 mm rods for deep or recessed plugs
• Flexible extension hose for angled or confined access

How accurate and durable is the gauge?

The large-dial analog meter with acrylic cover and rubber boot is built for shop use, offering shock absorption and clear visibility. A built-in check valve holds peak pressure so you can read the maximum compression after cranking, improving test consistency.

• Dual-unit dial (PSI and BAR) for international use and easy comparison
• Acrylic lens and rubber protective cover resist impacts and drops
• Internal check valve retains peak pressure for simple reading after engine crank
• Metal adapters and extensions provide reliable thread engagement and longevity

Can I use this kit on all engines and how do I use it safely?

This kit is intended for gasoline (petrol) engines only and is not suitable for diesel engines. For safe and accurate tests, follow basic engine safety: disable ignition, crank the engine only with the starter, and record readings cylinder by cylinder under the same conditions.

• Not intended for diesel engines — use only on petrol spark-ignition engines
• Always disable ignition/coils and remove fuel pump fuse before testing
• Crank engine with throttle fully closed and record the peak gauge reading
• Compare readings across cylinders to detect irregularities

Who is this for? Prokomon’s Petrol Engine Compression Tester Kit is a practical tool for DIY mechanics, motorcycle and small-engine owners, maintenance technicians and professional garages that need a quick way to verify cylinder health. If you work on cars, ATVs, lawn equipment or motorcycles and want repeatable compression results with a single kit that fits most spark plug sizes, this set gives the adapters, extensions and a rugged gauge to get the job done accurately and efficiently.