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.

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Description

⚡ Diagnose your spark like a pro—don’t let your engine miss a beat!

MADE IN THE USA - Trusted quality and reliability from a renowned automotive brand
LIGHTWEIGHT DURABLE - Robust metal build at just 113g, designed for professional use
DUAL ENDED VERSATILITY - Straight and 90° boots on one tool for every spark plug setup
PLUG PLAY SIMPLICITY - Connects effortlessly between spark plug and wire for real-time spark visualization
INSTANT IGNITION INSIGHT - Quickly diagnose all ignition systems without guesswork

The Lisle 20610 Inline Spark Tester is a compact, battery-free diagnostic tool designed to quickly identify ignition system issues. Featuring a dual-ended design with both straight and 90° boots, it connects easily between spark plug and wire, flashing a mirror image of the ignition spark while the engine runs. Lightweight and made from durable metal in the USA, it’s an essential tool for professional mechanics and serious DIYers aiming for precision and efficiency.

Specifications

Brand	Lisle
Power Source	Battery Powered
Style	Inline Spark Tester
Colour	Red
Item Weight	0.25 Pounds
Item dimensions L x W x H	26.7 x 14.6 x 2.5 Centimeters
Measurement Type	Volts
UPC	083045206101
Manufacturer	Lisle
Global Trade Identification Number	00083045206101
Model	20610
Model Name	Lisle 20610 Inline Spark Tester
Product Dimensions	26.67 x 14.61 x 2.54 cm; 113.4 g
Item model number	20610
Compatible Devices	Air Cleaner
Mounting Hardware	Spark Tester
Number of items	2
Batteries Included	No
Batteries Required	No
Material	Metal
Does it contain liquid?	No
Country of Origin	USA
Item Weight	113 g

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