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

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

Product ID: 341059989

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Details

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

💡Dual LED indicators for real-time feedback

🎚️Adjustable sensitivity dial

🛡️Durable high-impact ABS housing

Description

⚡ Ignite your diagnostics with precision and confidence!

BUILT TO ENDURE - Rugged ABS casing resists oil and harsh shop environments, ensuring long-lasting reliability.
INSTANT VISUAL FEEDBACK - Green LED confirms tester readiness; red LED flashes with each ignition pulse for real-time monitoring.
SAFETY SPEED COMBINED - Quickly troubleshoot 'no-start' issues, making electrical diagnostics faster and safer.
UNIVERSAL COMPATIBILITY - Seamlessly tests both DIS and conventional ignition systems without wire piercing.
PRECISION SENSITIVITY CONTROL - Exclusive dial isolates specific plug wires, eliminating false signals for pinpoint diagnostics.

The Calterm 66331 Tru-Spark Ignition Firing LED Indicator features an exclusive adjustable sensitivity dial to isolate plug wires and prevent false signals. Equipped with green and red LEDs for clear operational feedback, it’s housed in a durable ABS casing designed to withstand tough shop conditions. Compatible with both DIS and conventional ignition systems, this lightweight tester enables fast, non-invasive troubleshooting of ignition faults, making it an essential tool for professional mechanics and electrical technicians.

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The delivery time was excellent, and the packaging was secure.

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€ 42.33

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Manufacturer	Calterm
Brand	Calterm
Model	66331
Product Dimensions	5.59 x 14.99 x 3.56 cm; 18 g
Item model number	66331
Manufacturer Part Number	66331
Item Weight	18 g

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

Details

Description

Specifications

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