Hi, no it's not for clamping on, it's for detecting for a spark and so you just touch it on the ht lead

does it work on small engine 4-cycle, 12V

Our Service dept use this all the time on small engines. You do have to properly adjust the dial on the unit for small engines. We use as a quick test.

does this actually detect if the plug wire is pulled loose from the plug itself?

Probably not, but a good visual inspection should. I use it to narrow down suspect cylinders that have a misfire such as a defective coil or wire. I have also found plugs that arc inside the plug boots.

Will this work on fuel injectors ?

No- Just ignitions. Fuel injectors are low voltage.

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Calterm 66331 Tru-Spark Ignition Firing LED Indicator, Adjustable Sensitivity

Product ID: 341059989

Details

Brand
Calterm
Colour
Red
Item dimensions L x W x H
5.6 x 15 x 3.6
Power source
Battery
Style
Modern

💡Dual LED indicators for real-time voltage status

🎚️Adjustable sensitivity dial for pinpoint accuracy

🛡️Rugged ABS housing resists oil & shop wear

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HK$409

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Ignite your diagnostics with precision and confidence!

INSTANT VOLTAGE FEEDBACK - Green LED confirms tester readiness; red LED flashes with each ignition pulse for clear, immediate insights.
DURABLE SHOP READY DESIGN - High-impact ABS casing withstands harsh automotive environments, ensuring longevity and reliability.
FASTER SAFER TROUBLESHOOTING - Accelerate no-start diagnostics with a tool trusted by pros to prevent costly downtime and errors.
PRECISION SENSITIVITY CONTROL - Exclusive dial isolates specific plug wires, eliminating false signals and boosting diagnostic confidence.
UNIVERSAL IGNITION COMPATIBILITY - Seamlessly tests both DIS and conventional ignition systems without wire piercing or removal.

The Calterm 66331 Tru-Spark Ignition Firing LED Indicator is a professional-grade automotive tester featuring an exclusive adjustable sensitivity dial, dual LED indicators for real-time voltage detection, and a rugged ABS housing designed for tough shop conditions. Compatible with both DIS and conventional ignition systems, it enables quick, non-invasive troubleshooting of ignition circuits, making it an essential tool for efficient and safe automotive diagnostics.

Specifications

ASIN	B000JFHMPC
Best Sellers Rank	#110,837 in Automotive ( See Top 100 in Automotive ) #20 in Automotive Ignition Testers
Brand Name	Calterm
Color	Red
Compatible Devices	Vehicles with DIS or conventional ignition systems
Country Of Origin	China
Customer Reviews	4.2 4.2 out of 5 stars (353)
Global Trade Identification Number	00046494020230
Item Dimensions	5.6 x 15 x 3.6 centimeters
Item Type Name	LED Indicator
Manufacturer	Calterm
Measurement Type	Voltage
Model	66331
Part Number	66331
Power Source	Battery Powered
Specification Met	CE, ETL, RoHS, UL
Style Name	Modern
UPC	971473127474 046494020230 521227771189 956257381846
Unit Count	1.0 Count

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