Two independent sockets for side‑by‑side new/old plug testing. Compare spark color, strength & continuity to instantly spot faulty plugs.
Rotary knob simulates real engine revs. Higher frequency = stronger spark. Far more accurate than basic fixed‑rate testers.
Fits 99% of 12V gasoline cars & motorcycles (spark plug Ø ~12mm). Durable ABS heat‑resistant housing.
Power LED + two high‑voltage signal lights. Simple operation: insert plug, connect 12V, and test.
Ensure switch is OFF before inserting or removing spark plugs.
Place plug into socket 1 or 2. For comparison: new in 1, old in 2.
Use car battery or 12V adapter. Indicator (3) lights up.
Rotate switch (4) clockwise to power on (≈1000 RPM default). Turn further to increase up to 5000 RPM.
✅ Good: strong blue/white ⚠️ Weak: reddish / intermittent
Evaluate performance difference between new and old plugs at same frequency.
⚠️ IMPORTANT SAFETY & COMPATIBILITY
⚡ Fast shipping · 30-day returns