Using this to test the coil on my vehicle. I get intermittent small reddish flash. Not sure how to interpret this? Is any light a positive sign?

Use the tester in a dim lighting area and when you see the reddish-orange flash, that shows a bad spark. A healthy spark will be more intense with a blueish-white spark. I used this tester on my riding mower on June 1, 2015 and replaced the ignition module (same as a vehicle coil). The tester showed the difference before and after!

Can this be used for my 115 outboard motor?

Yes Ihave used it Mine and Ihave Used it on Lawnmovers

How do you use this with a lawnmower that doesn't start? Hooking it up is simple, but then what? Pull the recoil starter rope & look at the light?

Yes, if it starts the light will flash everytime the sparkplug sparks. If it does not start the light will flash everytime the sparkplug gets power and then you know it is not an electrical problem. It can then be either a bad sparkplug or a fuel problem. If it does not flash when you pull the rope then it is an electrical malfunction (ie. magneto, points, or electronic ignition problem). Always test your light to make sure it works on something else that runs.

Lisle 20610 Inline Spark Tester One Size Factory

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Description

⚡ Diagnose your spark, own the start!

DUAL ENDED VERSATILITY - Straight and 90° boots in one compact tool for all spark plug setups.
LIGHTWEIGHT PORTABLE - Compact 122g design fits easily in any mechanic’s toolkit.
UNIVERSAL COMPATIBILITY - Works seamlessly with all ignition systems for professional-grade testing.
INSTANT IGNITION INSIGHT - Quickly diagnose ignition issues without guesswork.
REAL TIME SPARK VISUALIZATION - See a mirror image of the ignition spark while the engine runs.

The Lisle 20610 Inline Spark Tester is a patented, dual-ended diagnostic tool that provides a real-time visual check of ignition systems by flashing a mirror image of the spark while the engine runs. Lightweight and compatible with all ignition systems, it enables fast, accurate troubleshooting for automotive professionals and enthusiasts alike.

Reviews

User

Time Saver

Perfect for the job saves time

19.01.2026

User

Works well

Much better than the 1 peice tester the light bulb sits straight and easy to see

16.07.2026

User

Funkt

Funktioniert wie erwartet, Funke gut sichtbar!

8.05.2026

User

Excelente producto

Muy útil. Pará identificar fallos en cables y bujías. Y saber si hay chispa.

13.03.2023

User

Handy little tester for my car

Great tiny tool for my dorm car kit. I got this because my old Honda sometimes acts up and I do a lot of my own stuff in the parking lot. This lets me check if a plug is actually firing before i start throwing money at random parts. I just clip it on, crank the engine, and watch for the little light. Super simple. Used it last week when my roommate’s Civic wouldn’t start after a late Target run and it helped us figure out it was fuel, not ignition, so we didn’t panic reallly hard. Fits in my pencil box with my fuses and a mini screwdriver, which is kind of funny but it works.

7.08.2026

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Asin	B0002STSC6
Best Sellers Rank	#49 in Automotive Spark Plug & Ignition Tools
Date First Available	1 January 2024
Department	unisex-adult
Is Discontinued By Manufacturer	No
Item Model Number	20610
Manufacturer	Lisle
Product Dimensions	26.67 x 14.61 x 2.54 cm; 122.47 g

Lisle 20610 Inline Spark Tester, One Size, Factory

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Common Questions