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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Lisle 20610 Inline Spark Tester, One Size, Factory

Lisle 20610 Inline Spark Tester, One Size, Factory

Product ID: 254740982

Details

Brand
Lisle
Colour
Red
Item weight
122 g
Power source
Hand Powered
Style
Inline Spark

⚡Visual spark check

🔄Dual-ended design

⏱️Instant ignition diagnosis

฿1871

Duties & taxes included

In stock

Sold byAmazon ThailandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Diagnose your ignition like a pro—no sparks left unseen!

TRUSTED PRECISION - Patent-backed design ensures reliable spark visualization.
DURABLE REPLACEABLE - Built to last with a replaceable bulb for long-term use.
DUAL ENDED VERSATILITY - Straight and 90° boots in one tool for seamless testing.
TIME SAVING EFFICIENCY - Cut troubleshooting time and get back on the road faster.
INSTANT IGNITION INSIGHT - Quickly diagnose ignition issues without guesswork.

The Lisle 20610 Inline Spark Tester is a durable, dual-ended tool designed for quick and accurate visual diagnosis of ignition systems. Compatible with standard spark plugs and wires, it features a replaceable bulb and patented technology to ensure reliable performance, making it a must-have for efficient automotive troubleshooting.

Specifications

ASIN	B0002STSC6
Best Sellers Rank	#33,195 in Automotive ( See Top 100 in Automotive ) #38 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 5,993 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	122 g
Item dimensions L x W x H	26.7 x 14.6 x 2.5 centimeters
Item weight	122 g
Manufacturer	Lisle
Measurement Type	Ohmmeter
Model	20610
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

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