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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⚡ Diagnose Like a Pro — Never Miss a Spark!

COMPACT LIGHTWEIGHT - At just 0.634 ounces and pocket-sized, it’s the perfect on-the-go diagnostic companion.
INSTANT VISUAL FEEDBACK - Green LED confirms tester readiness; red LED flashes with each ignition pulse for clear, immediate insights.
UNIVERSAL COMPATIBILITY - Seamlessly tests both DIS and conventional ignition systems, making it the go-to tool for pros.
BUILT FOR HARSH ENVIRONMENTS - Durable high-impact ABS casing stands up to oil, grease, and tough workshop conditions without fail.
PRECISION SENSITIVITY CONTROL - Exclusive dial isolates specific plug wires, eliminating false signals and boosting diagnostic confidence.

The Calterm 66331 Tru-Spark Ignition Firing LED Indicator is a precision electrical tester featuring an exclusive adjustable sensitivity dial, dual green and red LED indicators for real-time ignition status, and a rugged ABS housing designed to withstand harsh workshop environments. Compatible with both DIS and conventional ignition systems, this compact, battery-powered tool ensures fast, accurate troubleshooting of ignition issues without wire piercing.

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Malistore

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Brand	Calterm
Power Source	Battery Powered
Style	Adjustable
Color	Green,Red
Item dimensions L x W x H	2.2 x 5.9 x 1.4 inches
Specification Met	CE, ETL, RoHS, UL
UPC	971473127474 046494020230 521227771189 956257381846
Manufacturer	Calterm
Global Trade Identification Number	00046494020230
Model	66331
Item Weight	0.634 ounces
Product Dimensions	2.2 x 5.9 x 1.4 inches
Item model number	66331
Is Discontinued By Manufacturer	No
Manufacturer Part Number	66331

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

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