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⚡ Diagnose like a pro, fix like a boss!
The Lisle 20580 InLine Spark Tester is a professional-grade diagnostic tool designed to instantly visualize ignition sparks. Featuring a dual-ended wire with both straight and 90-degree boots plus a 7-inch extension for hard-to-reach coil-on-plug wires, it ensures versatile compatibility across all ignition systems. Built for durability with a replaceable bulb and backed by a limited lifetime warranty, this tester is a must-have for precise, long-term engine troubleshooting.


| ASIN | B09NMHFGXD |
| Best Sellers Rank | #2,689 in Automotive ( See Top 100 in Automotive ) #8 in Spark Plug & Ignition Tools |
| Brand | Lisle |
| Brand Name | Lisle |
| Color | for all Ignition Systems |
| Compatible Devices | Internal combustion engines with spark plugs and ignition systems |
| Customer Reviews | 4.6 out of 5 stars 602 Reviews |
| Global Trade Identification Number | 00083045205807 |
| Included Components | tster and wires |
| Item Dimensions | 7 x 14 x 2 inches |
| Item Type Name | Tester |
| Item dimensions L x W x H | 7 x 14 x 2 inches |
| Manufacturer | Lisle |
| Model | 20580 |
| Part Number | 20580 |
| Power Source | Hand Powered |
| Style | InLine Spark Tester w/ Coil On Plug Wire |
| Style Name | InLine Spark Tester w/ Coil On Plug Wire |
| UPC | 083045205807 |
| Unit Count | 1.0 Count |
| Warranty Description | Limited Lifetime |
J**L
Great quality.
Great product and much better than the orange product that is similar to this one that is sold on Amazon. Well worth the money. Great quality.
E**A
Testing spark plugs
Work as Design, thank you
B**.
Works well
Worked terrific for a 2013 Chevy equinox, verified spark
J**H
Good price
Always quality
R**Y
Pretty handy
Great for testing if small engine is getting ignition
J**J
Great item
Good quality, easy to work with, works great, bright light, like the longer boot for coil packs. Struggled with the shorter one in the beginning. I have the dreaded 5.4l 3 valve v8 F-150 and sparkplugs were just to start with....
T**R
Good
Works good can see the spark
.**2
Lisle makes quality tools
Lisle makes quality tools
J**N
Goood Quailty
Great product and long plug to go down in the cylinder to connect to the spark plug and great to put onto the coils, long enough to see from cyclinder 1 and 8
J**E
Fácil de usar
Producto de fácil uso y buena calidad y muy buen precio.
J**P
Spark tester
Good tester for deep set sparkplugs
E**S
Excelente herramienta
Justo para el trabajo
R**Y
Great tester!!!
Amazing price; works well. Great way of checking coils and plugs on the quick and save some money on diagnosis. Usually plugs are fairly cheap to fix if you do them at home and these definitely help keeping minor fixes cheap.
Trustpilot
2 weeks ago
1 month ago