DAYUAN Petrol Engine Compression Tester Kit - Red Case, 3" Dual-Scale Gauge & Multi-Adapters

The DAYUAN Professional Petrol Engine Compression Tester Kit is a complete portable set for checking petrol engine cylinder compression quickly and accurately.

This compact kit comes in a durable red case and includes a 3-inch dual-scale gauge, multiple thread fittings and spark plug adapters, plus two rubber cone ends for non-invasive checks. Designed for mechanics, home DIYers and fleet technicians, the set covers a broad range of petrol engines and spark plug depths so you can diagnose cylinder sealing, valve condition and overall engine health without disassembly.

Which engines and spark plugs will this kit work with?

The DAYUAN kit supports most common petrol engines by providing several threaded fittings and spark plug adapters to match different sizes and depths. It’s ready for vehicles with M10, M12, M14 and M18 spark plug threads and includes both 14mm and 18mm adapters for popular plug types.

• M10, M12, M14, M18 male fittings with O-rings for reliable sealing
• 14mm and 18mm spark plug adapters to fit most cars and small engines
• Two rubber cone ends for quick, non-threaded compression checks

How accurate and easy-to-read is the gauge?

The kit’s 3-inch gauge displays readings in both 0–300 psi and 0–20 bar for straightforward interpretation and compatibility with different measurement preferences. Its dual-color scale highlights common operating ranges so you can spot weak cylinders at a glance during diagnostics.

• 3" analog gauge with dual psi and bar scales
• Dual-color marking for quick visual assessment
• Robust needle and clear face for workshop conditions

What accessories are included, and how do they speed up testing?

The kit bundles a range of adapters and fittings inside a protective case so you have everything on hand when troubleshooting. The rubber cone ends let you perform a rapid leak-down style check without threading into the head, saving time on initial inspections.

• Red hard case organising gauge, hoses and fittings for transport
• Hoses and quick-connect fittings for repeatable tests
• Two rubber cone ends for fast, temporary compression checks

How should I use the DAYUAN tester safely and effectively?

Always follow basic engine test procedures: disable ignition, remove all spark plugs, crank the engine consistently and compare readings across cylinders. Use the included adapters that match your spark plug threads, and seal connections with the provided O-rings to prevent false low readings.

• Disable ignition and fuel systems before testing
• Remove spark plugs and install the correct adapter for each cylinder
• Crank engine with starter for consistent measurements and compare cylinders

Who is this for: The DAYUAN Professional Petrol Engine Compression Tester Kit is aimed at automotive technicians, small-engine repairers, vehicle inspectors and hands-on DIYers who need a portable, full-featured compression testing solution. If you service multiple vehicle makes or frequently diagnose petrol engine issues, this kit gives you a versatile gauge, multiple fittings and practical quick-check cones in a compact, transportable case so you can get reliable readings at the shop or roadside.