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

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

💡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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180466Fr

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Description

⚡ Ignite your diagnostics with precision and confidence!

SPEEDY TROUBLESHOOTING - Quickly identifies ignition faults to get your vehicle back on the road faster, avoiding costly downtime.
INSTANT VISUAL FEEDBACK - Green LED confirms tester readiness; red LED flashes with each voltage pulse for clear ignition status.
UNIVERSAL COMPATIBILITY - Seamlessly tests both DIS and conventional ignition systems without wire piercing or removal.
PRECISION SENSITIVITY CONTROL - Exclusive dial isolates specific plug wires, eliminating false signals and boosting diagnostic confidence.
DURABLE BUILD FOR TOUGH ENVIRONMENTS - High-impact ABS casing withstands oil exposure and harsh workshop conditions, ensuring longevity.

The Calterm 66331 Tru-Spark Ignition Firing LED Indicator features an exclusive adjustable sensitivity dial to isolate spark plug wires and prevent false readings. Equipped with green and red LEDs, it provides instant visual confirmation of ignition voltage pulses. Built with rugged ABS housing, it resists oil and harsh shop conditions. Compatible with both DIS and conventional ignition systems, this battery-powered tester enables fast, non-invasive troubleshooting of ignition faults, making it an essential tool for automotive professionals.

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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180466Fr

Duties & taxes included

In stock

Sold byAmazon CongoDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Congo.

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