BLAU GRUN

Inline Spark Plug Tester Straight Boot Engine Ignition Tester Light Easy to Use Small Armature Diagnostic Detector Tool

$4.99$21.99

1259+ bought in the past month

About this item

  • 【Wide Application】: The inline spark plug tester is a must have diagnostic tool for any engine with a spark plug, it fit for all internal and external combustion engines, cars, trucks, motorcycles, lawnmowers, chainsaws, trimmers, snow-blowers, generators engines etc. Spark plug tester apply to any household, business, mechanic, industrial and commercial spark plug use in engine.
  • 【Premium Materials】: The probe of this spark tester is made of high quality plated shaft, the optical housing is made of environmental friendly acetate plastic, and rubber straight jacket and cable. High quality materials are resistant to rust and corrosion, even in high and low temperature environments.
  • 【Easy to Use】: Easily determine which cylinder is causing issues with this spark plug test light; Simply connect the spark detector spark plug tool between the spark plug and the plug wire then start the engine; If sparks are being sent, the in line spark tester will mirror the spark by lighting up; If checking a no start condition, have a friend crank the engine so you can watch for indications of a spark.
  • 【Light Indication】: The spark plug engine ignition test kit is equipped with a high intensity neon bulb inside, which makes it easy to know if the ignition wires are intact by flashing. By light indicator shows of spark plug engine ignition tester to determine which cylinder is causing the issue and track down the exact cause.
  • 【Excellent Customer Service】: We are dedicated to researching in-car products to improve driving safety and comfort, bringing you a pleasant driving experience. Should you have any questions, please do not hesitate to let us know. We are ready to help you!
$4.99
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Product details
BrandBLAU GRUN
Power SourceCorded Electric
ColorWhite/1PCS
Item Weight0.06 Kilograms
Specification MetCE, ETL, RoHS, UL

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Customer reviews

4.41,187 ratings
  1. 575%
  2. 413%
  3. 313%
  4. 20%
  5. 10%

Customers say

Customers find the spark plug tester works well with small engines and appreciate its solid construction and cost-effectiveness.

★★★★★

nice tool, comes in handy

Paul KalalFebruary 7, 2026✓ Verified purchase

Very handy lil took to check for spark. Works good. Read more

★★★★★

Works

Ryan SwobApril 1, 2026✓ Verified purchase

Used it to diagnose a chainsaw. So far, it works as intended. Read more

★★★★☆

Nice price.

Alan J. WilsonOctober 19, 2025✓ Verified purchase

Tested it on lawn mower plug. Works! Hard to see in direct sunlight. Best to do in shade. Read more

★★★★★

Easy to use good price. A must have tool for troubleshooting

Drenzer1February 16, 2026✓ Verified purchase

Did the job Read more

★★★★★

Simple, Handy Tool

MatayahNovember 25, 2025✓ Verified purchase

I bought this for my husband and he said it worked perfectly. Super straightforward to use and helped him quickly figure out which plug was misfiring. Nice solid little tool that does exactly what it’s supposed to. Read more

★★★☆☆

Not for pull start engines.

FranJanuary 12, 2026✓ Verified purchase

Works with small engines!. NOT REALLY! I bought this to troubleshoot a single cylinder pull start generator. I could not get it to work. After trying it on other small engines I concluded that it works on small ELECTRIC START engines. Pull start engines will not light the tester. For all my electric start engines it worked well. Read more

★★★★★

GOOD

Christopher DavisFebruary 17, 2026✓ Verified purchase

Worked GREAT Read more

★★★★★

Not a bad investment

v-12July 11, 2025✓ Verified purchase

This inline spark plug tester is a total game-changer for diagnosing ignition problems. It’s simple to use—just plug it in between the spark plug and the ignition wire, and you can instantly see if the spark is firing correctly. The visual indicator is clear and easy to read, making troubleshooting fast and stress-free. It’s a great tool to have, whether you’re a professional mechanic or a DIYer working on small engines, cars, or lawn equipment. For the price and functionality, you really can’t beat it. Highly recommend! Read more

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