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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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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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 coil testing

📏High visibility white lettering for easy gap measurement

⏱️Quick diagnosis of no-start ignition issues

€ 22.89

Duties & taxes included

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Description

⚡ Spark Smarter, Drive Confidently – Don’t Get Left in the Dark!

SAFETY FIRST TESTING - Avoid costly coil damage and fire hazards by verifying ignition system integrity before engine start.
USER FRIENDLY DESIGN - High-contrast white lettering and ergonomic build make testing intuitive and hassle-free.
UNIVERSAL COMPATIBILITY - Works seamlessly with all vehicles featuring ignition coils and spark plugs—your go-to diagnostic tool.
INSTANT IGNITION HEALTH CHECK - Detect no-start conditions faster than ever with real-time spark color and distance analysis.
PRECISION SPARK GAP ADJUSTMENT - Screw assembly lets you fine-tune spark gap in seconds, ensuring accurate coil diagnostics every time.

The OriGlam Adjustable Ignition Coil Tester is a professional-grade diagnostic tool designed for quick and precise testing of ignition coils and spark plugs. Featuring an adjustable spark gap, high-visibility markings, and universal compatibility, it empowers automotive professionals and enthusiasts to identify ignition issues rapidly, preventing engine start failures and costly repairs.

Specifications

ASIN	B06X9RC3PF
Best Sellers Rank	13,953 in Automotive ( See Top 100 in Automotive ) 24 in Car Spark Plug Wrenches
Brand	OriGlam
Colour	Black
Compatible Devices	All vehicles with ignition coils and spark plugs
Country Of Origin	China
Customer Reviews	4.3 4.3 out of 5 stars (1,834)
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
Number of Items	1
Number of Packs	1
Power Source	Corded Electric
Specification Met	CE, RoHS
Style Name	Classic
Unit Count	1.0 count

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