Brand: Lisle Manufacturer's Part Number: 20610 Part Type: Ignition Testers Product Line: Lisle Inline Spark Testers Summit Racing Part Number: LIL-20610 UPC: 083045206101 LCD Readout: No Checks and Tests Ignition: Yes Checks and Tests Coil: Yes Checks and Tests Rev Limits: No Checks and Tests RPM Switch Operation: No Checks and Tests Shift Level RPM: No Checks and Tests Tachometer Accuracy: No Quantity: Sold individually. Lisle Inline Spark Testers Lisle inline spark testers offer a visual check of your ignition system. These Lisle tools flash a mirror image of your ignition spark so you can see exactly what's happening. Simply connect these spark testers between the spark plug and the plug wires and start your engine. The tools are double-ended to fit straight and 90 degree boots， plus any ignition system can be quickly diagnosed for problems. It's time to tune up with Lisle inline spark testers.