Brand: OEMTools Manufacturer's Part Number: 25069 Part Type: Ignition Testers Product Line: OEM Automotive Tools Spark Plug Wire Testers Summit Racing Part Number: OES-25069 UPC: 076812250698 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. OEM Automotive Tools Spark Plug Wire Testers OEM Automotive Tools spark plug wire testers are handy devices to locate faulty wires， with enough length to reach difficult areas. Spark plug wires can last up to 50，000 miles， but they're such vital cogs in the electrical trail， it's wise to inspect them regularly. If the outer insulation is cracked， sparks can escape and affect auto performance， fuel economy， and emissions. It's an easy test to maintain your spark!