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.Duty & taxes paid at delivery

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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.

Specifications

ASIN	B0002STSC6
Best Sellers Rank	#53,811 in Automotive ( See Top 100 in Automotive ) #49 in Automotive Spark Plug & Ignition Tools
Brand	Lisle
Brand Name	Lisle
Color	Red
Colour	Red
Compatible Devices	Vehicles with standard spark plug and spark plug wire connections
Customer Reviews	4.7 out of 5 stars 6,030 Reviews
Global Trade Identification Number	00083045206101
Included Components	Spark Tester
Item Dimensions	26.7 x 14.6 x 2.5 centimeters
Item Type Name	Spark Tester
Item Weight	0.27 Pounds
Item dimensions L x W x H	26.7 x 14.6 x 2.5 centimeters
Item weight	0.27 Pounds
Manufacturer	Lisle
Measurement Type	Ohmmeter
Model	20610
Number of Items	1
Number of Packs	1
Part Interchange Info	20610
Part Number	20610
Power Source	Hand Powered
Power source	Hand Powered
Specification Met	CE, EN 61010-1, RoHS, UL
Style	Inline Spark Tester
Style Name	Inline Spark Tester
UPC	083045206101
Unit Count	1.0 Count

Reviews

R**N

Time Saver

Perfect for the job saves time

19.01.2026

N**K

Works well

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

16.07.2026

T**T

Funkt

Funktioniert wie erwartet, Funke gut sichtbar!

8.05.2026

D**E

Handy little spark tester for the car

I grabbed this after my old van started misfiring and my husband kept guessing which coil was bad. we’ve already got three kids and no extra time or money for random parts. This made it so much simpler. You just pop it in line and crank the engine, and you can actually see which cylinder is firing. I used it one nap time in the driveway and we found the bad plug wire in minutes. That moment alone made me really glad i ordered it. It’s small, tough enough for the junk drawer, and now it lives with our basic car tools.

25.08.2026

K**N

Excelente producto

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

13.03.2023

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TrustScore 4.5 | 7,300+ reviews

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