Connects in-line between spark plug and spark plug wire
Shows a duplicate view of the ignition spark
Visually check condition of ignition system at each cylinder
Frequency and intensity of flash indicates whether problem is ignition or fuel related
Tough, clear plastic body resists automotive chemicals
IST2390-Ignition Spark Tester with 90° boot
IST239-Ignition Spark Tester with straight boot
Return Policy *
30-Day Risk FREE return for refund or replacement
If you are not 100% satisfied with your returnable items, return the product for a refund.
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