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

🔴Red LED flashes with each ignition pulse

🎚️Adjustable sensitivity dial for pinpoint accuracy

🛡️Rugged ABS housing resists oil & shop wear

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NT$2070

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Description

⚡ Diagnose with precision, test with confidence!

PRECISION ISOLATION - Exclusive sensitivity dial isolates specific plug wires, eliminating false signals and boosting diagnostic confidence.
BUILT FOR THE WORKSHOP - Durable high-impact ABS casing stands up to oil, grease, and tough shop environments without fail.
INSTANT VISUAL FEEDBACK - Dual LED indicators—green for power status, red for ignition pulses—keep you informed in real-time.
NO WIRE PIERCING NEEDED - Non-invasive testing protects spark plug wires while delivering fast, accurate secondary voltage readings.
UNIVERSAL COMPATIBILITY - Seamlessly tests both DIS and conventional ignition systems, making it your go-to ignition tester.

The Calterm 66331 Tru-Spark Ignition Firing LED Indicator is a professional-grade diagnostic tool featuring an exclusive adjustable sensitivity dial to isolate specific spark plug wires and eliminate false signals. Equipped with dual LED indicators for power and ignition pulse feedback, it operates on battery power and is housed in rugged ABS to withstand harsh workshop conditions. Compatible with both DIS and conventional ignition systems, it enables quick, non-invasive testing without piercing spark plug wires, making it essential for troubleshooting no-start issues efficiently and safely.

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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TrustScore 4.5 | 7,300+ reviews

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NT$2070

Duties & taxes included

In stock

Sold byAmazon TaiwanDelivered 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 Taiwan.

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TrustScore 4.5 | 7,300+ reviews

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