How long should the maximum spark length be if the system is in good shape? Would 1/4 inch max indcate a fault?

If you can get a spark to reach 1/4 of an inch on a sparkplug your doing well as your only talking mm with a sparkplug if it's for something else I'm sorry I can't help you but this tool is only an indicator as to how good your spark is hopefully this helps you

Basically it will fit anything that uses a spark plug, in my opinion it should just be called an ignition tester rather than an actual spark plug tester. I take the HT lead off the spark plug, push the brass end of the tester into the HT boot, ground the bulldog clip and turn over the engine to check for spark. I’ve found it very useful for troubleshooting ignition coils on small engines anyway.

Will this fit inside a Mercedes Bosch shielded cable end?

I am not familiar with Mercedes Bosch cable end, but it will fit any standard plug cap, so unless Mercedes use non standard spark plugs it should work.

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Spark Plug Tester, Adjustable Ignition System Coil Tester, Coil-on Plug Ignition Spark Circuit Tester, Autos Diagnostic Test Tool

Spark Plug Tester, Adjustable Ignition System Coil Tester, Coil-on Plug Ignition Spark Circuit Tester, Autos Diagnostic Test Tool

Product ID: 48654799

Details

Brand
OriGlam
Colour
Black
Item dimensions L x W x H
19 x 8 x 3
Power source
Corded
Style
Classic

⚡Adjustable spark gap for precise testing

📏High visibility white lettering for easy reading

🔧Quick screw assembly for fast setup

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Description

⚡ Ignite your diagnostics with precision and speed!

RAPID FIRE TESTING - Screw assembly enables lightning-fast adjustments, so you spend less time troubleshooting.
USER FRIENDLY DESIGN - High-contrast white lettering and ergonomic build make testing effortless and error-free.
ESSENTIAL TOOLBOX UPGRADE - Compact, lightweight, and reliable—your go-to tool for avoiding costly ignition failures.
INSTANT IGNITION INSIGHTS - Visual spark color and distance reveal coil health in seconds—no guesswork, just results.
PRECISION SPARK DIAGNOSIS - Adjustable gap lets you tailor tests for every ignition coil, ensuring pinpoint accuracy.

The OriGlam Spark Plug Tester is a professional-grade ignition coil tester featuring an adjustable spark gap, high-visibility white lettering for easy measurement reading, and a quick screw assembly for fast setup. Designed for automotive and motorcycle engines, it provides rapid, accurate diagnostics by analyzing spark color and distance to prevent ignition coil failures. Compact and lightweight, it’s an essential tool for any serious mechanic or enthusiast aiming to avoid no-start conditions and costly repairs.

Specifications

ASIN	B06X9RC3PF
Best Sellers Rank	11,434 in Automotive ( See Top 100 in Automotive ) 23 in Car Spark Plug Wrenches
Brand	OriGlam
Colour	Black
Country Of Origin	China
Customer Reviews	4.3 4.3 out of 5 stars (1,816)
Global Trade Identification Number	04895192448718
Item Dimensions	19 x 8 x 3 centimetres
Manufacturer	OriGlam
Manufacturer Part Number	16092020FQ
Measurement Type	Voltmeter
Model Number	OG-SPARKTEST-ADJ-001
Power Source	Corded Electric
Specification Met	CE, RoHS
Style Name	Classic
Unit Count	1.0 count

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S/.102

Duties & taxes included

In stock

Sold byAmazon PeruDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Peru.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

Imran F.

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