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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⚡ Diagnose your ignition like a pro—no guesswork, just spark!

PRECISION TESTED - Accuracy within ±0.05% for reliable results
CERTIFIED QUALITY - Meets CE, EN 61010-1, RoHS, and UL standards
NO BATTERIES NEEDED - Hand-powered for on-the-go convenience
DUAL ENDED VERSATILITY - Straight and 90° boots in one compact tool
INSTANT IGNITION INSIGHT - Visual spark feedback for rapid diagnostics

The Lisle 20610 Inline Spark Tester is a compact, hand-powered diagnostic tool designed to provide a clear visual check of ignition systems. Featuring a patented dual-ended design with both straight and 90° boots, it fits all spark plug wires and delivers precise spark feedback with ±0.05% accuracy. Certified to meet major safety and quality standards, this tool empowers professionals and enthusiasts to quickly identify ignition issues without batteries or complex setups.

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Manufacturer	Lisle
Part number	20610
Item Weight	113 g
Product Dimensions	26.67 x 14.61 x 2.54 cm; 113.4 g
Item model number	20610
Size	One Size
Color	Red
Style	Inline Spark Tester
Material	Metal
Power source type	Hand Powered
Item Package Quantity	1
Measurement System	English/Standard
Measurement Accuracy	+/-.05%
Specification met	CE, EN 61010-1, RoHS, UL
Specific uses	personal
Included components	Spark Tester
Batteries Included?	No
Batteries Required?	No

Lisle 20610 Inline Spark Tester, One Size, Factory

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