Product Details

Engine Cylinder Compression Tester, 0-300PSI/0-20BAR Dual Scale with 4 Adapters & 3" Gauge, for Gasoline Engine Diagnostic �� Product Overview Diagnose engine health with this Engine Cylinder Compression Tester! Features a 0-300PSI / 0-20BAR dual scale, a 3" (76mm) large dial with rubber protective boot, and 4 brass thread adapters covering most gasoline engine spark plug threads. The built-in one-way valve prevents pressure backflow, and the quick-release valve makes pressure release safe and easy. Ideal for cars, motorcycles, ATVs, UTVs, and snowmobiles! ✨ Key Features Dual Scale High Precision – 0-300PSI (0-20BAR/0-20kg/cm²) dual scale for clear, accurate readings 3" Large Dial – 76mm dial with rubber protective boot, shockproof and drop-resistant 4 Thread Adapters – M10×1.0, M12×1.25, M14×1.25, M18×1.5 for most gasoline engines Built-in One-Way Valve – Prevents pressure backflow for stable measurement Quick Release Valve – Knob-type pressure release for safe, convenient operation Pressure Tubes Included – Straight and curved tubes (15cm each) with rubber sleeves Storage Case Included – High-strength plastic toolbox for organized storage Wide Compatibility – Fits cars, motorcycles, ATVs, UTVs, snowmobiles, and more �� Technical Specifications Model: 810 Measurement Range: 0-300 PSI / 0-21 BAR / 0-20 kg/cm² Dial Diameter: 3 Inches (76mm) Dial Type: Dual-Scale Mechanical Pointer Material: Rubber, Aluminum Alloy, Brass, Low-Pressure Polyethylene Hose Length: 42cm One-Way Valve: Built-in Pressure Relief Valve: Knob-Type Quick Release Applicable Vehicles: Gasoline Engines (14mm/18mm Spark Plug Threads) Storage Case Size: 31cm × 20cm × 6cm Product Weight: Approx. 800g Adapter Material: Brass �� 9-Piece Set Contents Compression Pressure Gauge (3" Dial) × 1 51.3cm High-Pressure Hose (9mm Quick Connector) × 1 Brass Adapters × 4 (M10×1.0, M12×1.25, M14×1.25, M18×1.5) Straight Pressure Tube (15cm) × 1 Curved Pressure Tube (15cm) × 1 Plastic Tool Storage Case × 1 ⚠️ Spark plug removal tool NOT included �� Application Scenarios Engine fault diagnosis (piston rings, valves, head gaskets) Pre-purchase inspection for used cars Regular maintenance and compression ratio testing Before & after engine overhaul comparison Abnormal noise and power loss troubleshooting Auto repair shops and DIY enthusiasts Teaching and racing engine tuning �� How to Use Warm up engine to normal temperature Remove all spark plugs Press accelerator fully (throttle wide open) Install adapter and pressure gauge Crank starter 3-5 compression strokes Record maximum pressure reading Repeat for all cylinders and compare �� Judgment Standards Normal: Cylinder pressure within ±10% of standard value Low Pressure: Piston ring wear, valve sealing, or head gasket leakage High Pressure: Excessive carbon buildup or thin cylinder head Over 15% Difference: Indicates poor cylinder performance ⚠️ Safety Notes ⚠️ Disconnect fuel pump relay and ignition coil before testing ⚠️ Ensure battery cables are securely connected ⚠️ Never place fingers near rotating parts ⚠️ Never exceed gauge maximum range ⚠️ Release pressure slowly after testing ⚠️ Be careful of burns when testing hot engines ⚠️ Operate in a well-ventilated area ⚠️ Purchase Notes �� Suitable for 14mm and 18mm spark plug threads (gasoline engines) �� NOT suitable for diesel engines �� Some models may require additional dedicated adapters �� Manual measurement may result in 1-3mm tolerance