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

1. Warm up engine to normal temperature

2. Remove all spark plugs

3. Press accelerator fully (throttle wide open)

4. Install adapter and pressure gauge

5. Crank starter 3-5 compression strokes

6. Record maximum pressure reading

7. 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