Spark Plug Tester, Dual Holes Automotive Engine Ignition Coil Tester 0 to 6000RPM Adjustable Working Frequency Car Motorcycle Spark Tester Tool for 12V Gasoline Vehicles Spark Plug Socket. If less than 12MM or the spark plug is too long, place shims on sockets before insert long spark ,can work normally.

Brand: Unbranded
Power Source: Corded Electric
Color: Blue
Style: Modern
Item Weight: 310 Grams