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, Green,Red

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

Product ID: 7531859

Details

Brand
Calterm
Color
Green Red
Item dimensions L x W x H
2.2 x 5.9 x
Power Source
Battery
Style
Adjustable

🎚️Adjustable sensitivity dial for precision

🛡️Durable ABS housing resists oil & impact

🔴🟢Dual LED indicators for real-time status

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Rp1243458

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Sold byAmazon IndonesiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Never miss a spark—ignite your diagnostics with precision and confidence!

BUILT TO ENDURE - Rugged high-impact ABS casing withstands harsh shop environments and oil exposure without fail.
COMPACT LIGHTWEIGHT - At just 0.634 ounces and pocket-sized, it’s the perfect on-the-go ignition tester for busy technicians.
INSTANT VISUAL FEEDBACK - Green LED confirms tester readiness; red LED flashes with each ignition spark for real-time monitoring.
UNIVERSAL COMPATIBILITY - Seamlessly works with both DIS and conventional ignition systems, making it a versatile tool for pros.
PINPOINT IGNITION ACCURACY - Exclusive sensitivity dial isolates specific plug wires, eliminating false signals for flawless diagnostics.

The Calterm 66331 Tru-Spark Ignition Firing LED Indicator is a compact, battery-powered tool featuring an exclusive adjustable sensitivity dial to isolate plug wires and prevent false signals. Equipped with green and red LEDs for clear operational and ignition feedback, it boasts a rugged ABS housing designed to resist oil and endure tough shop conditions. Compatible with both DIS and conventional ignition systems, this precision tester is engineered for professional-grade ignition diagnostics.

Specifications

ASIN	B000JFHMPC
Best Sellers Rank	#274,884 in Automotive ( See Top 100 in Automotive ) #311 in Powersports Ignition Coils
Brand Name	Calterm
Color	Green,Red
Compatible Devices	Vehicles with DIS or conventional ignition systems
Customer Reviews	4.2 4.2 out of 5 stars (367)
Global Trade Identification Number	00046494020230
Item Dimensions	2.2 x 5.9 x 1.4 inches
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	Adjustable
UPC	971473127474 046494020230 521227771189 956257381846
Unit Count	1.00 Count

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