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

🔧Universal compatibility with all ignition coils

$U1226

Duties & taxes included

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Sold byAmazon UruguayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Ignite your diagnostics with precision and speed!

RAPID NO START DIAGNOSIS - Identify ignition coil issues instantly to avoid costly downtime and frustrating delays.
DURABLE PROFESSIONAL BUILD - Robust plastic and metal design guarantees reliable performance on every diagnostic mission.
CLEAR EASY TO READ DISPLAY - High-contrast white lettering ensures you never miss a critical measurement, even in low light.
PRECISION SPARK GAP ADJUSTMENT - Quickly calibrate spark distance with an intuitive screw assembly for flawless ignition testing.
UNIVERSAL VEHICLE COMPATIBILITY - Seamlessly test ignition coils across all cars and motorcycles—one tool for every ride.

The OriGlam Adjustable Ignition Coil Tester is a professional-grade diagnostic tool designed for quick and accurate testing of ignition coils and spark plugs. Featuring an adjustable spark gap, universal compatibility, and high-visibility markings, it empowers automotive professionals and enthusiasts to swiftly diagnose no-start conditions and maintain optimal engine performance.

Specifications

ASIN	B06X9RC3PF
Best Sellers Rank	14,233 in Automotive ( See Top 100 in Automotive ) 23 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 (1,836)
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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TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

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