Fiada 9-Piece Compression Tester Kit & Spark Plug Tester, Blue — 0–300 PSI Gauge, Universal Adapters

This compact diagnostic set gives DIY mechanics and professional technicians the basic tools needed to check cylinder compression and confirm spark in virtually any gasoline engine. The kit includes a 3-inch dual-unit dial (PSI and kg/cm²), assorted brass and rubber adapters, a 14-inch extension hose, plus a spark probe—neatly packed in a protective ABS case for storage and transport. Everything is designed to be straightforward to use during routine tune-ups, troubleshooting mise-fires, or pre-purchase inspections.

How do I use the compression tester to check engine health?

Testing compression requires a few preparatory steps: disable fuel delivery and ignition, remove the spark plug, and screw the tester into the plug hole. Crank the engine several revolutions and read the peak pressure on the dial; repeat for each cylinder to compare values and identify weak or leaking cylinders.

• Disable fuel pump or remove injection fuse and disconnect ignition coil.
• Hand-thread gauge into the spark plug hole to avoid cross-threading.
• Crank the engine 3–5 revolutions at normal starting speed for reliable readings.
• Record and compare PSI or kg/cm² between cylinders to spot irregularities.

What makes the spark plug tester useful for diagnosing ignition problems?

The included spark probe mirrors the actual spark being delivered by the ignition system, so you can quickly determine whether spark is present and consistent while the engine is cranking. That visual check helps isolate bad plugs, damaged wires, failed coils, or grounding issues without guessing.

• Connect the spark probe between ignition wire and plug boot to see spark activity.
• Visual spark indicates the ignition is firing; no spark suggests wiring or coil faults.
• Safe for bench and in-vehicle checks when engine is disabled appropriately.
• Useful for troubleshooting intermittent misfires and starting faults.

Which adapters and gauge features improve accuracy and fitment?

The kit includes straight and curved rubber cone adapters plus four brass fittings that adapt to a wide range of spark plug threads and recessed ports. The 3-inch dial displays both PSI and kg/cm², and the rubberized gauge housing with anti-scratch cover helps protect the instrument during garage work.

• Straight and curved rubber cone ends seal odd-shaped recesses in older or specialty engines.
• Four brass adapters cover common thread sizes for cars, motorcycles, ATVs and small engines.
• 14-inch extension hose lets you reach tight or deep spark plug locations safely.
• Rubber-shrouded gauge face reduces shock and prolongs accuracy on the job.

Are there important safety or preparation steps before testing?

Yes — always remove ignition power and fuel sources before inserting or removing testers, and never touch live ignition components while the engine is running. Use hand-threading to avoid damaging spark plug holes, and ensure all fittings are secure before cranking to prevent leaks or misreads.

• Switch off engine and remove key before handling test components.
• Disconnect spark plug wires and disable fuel system to avoid engine start and fire risk.
• Confirm all adapter connections are tight to prevent pressure loss during measurement.
• Handle the spark probe only when the ignition is disabled to avoid electric shock.

Who this kit is for: The Fiada 9-piece compression and spark tester set is suited to home enthusiasts, mobile mechanics, and small shop technicians who need a portable, all-in-one diagnostic solution for gasoline engines. It’s particularly helpful for routine maintenance, pre-purchase engine checks, and isolating ignition versus compression-related faults on cars, motorcycles, ATVs, snowmobiles, boats, and similar equipment.