---
product_id: 780508627
title: "Calterm 66331 Tru-Spark Ignition LED Indicator, Adjustable Sensitivity, Green, Red"
brand: "calterm"
price: "$U82"
currency: UYU
in_stock: false
url: https://www.desertcart.uy/products/780508627-calterm-66331-tru-spark-ignition-led-indicator-adjustable-sensitivity-green
store_origin: UY
region: Uruguay
---

# Red LED flashes on coil voltage release Green LED confirms tester & battery health Adjustable sensitivity dial for precision Calterm 66331 Tru-Spark Ignition LED Indicator, Adjustable Sensitivity, Green, Red

**Brand:** calterm
**Price:** $U82
**Availability:** ❌ Out of Stock

## Summary

> ⚡ Diagnose like a pro, spark your workflow!

## Quick Answers

- **What is this?** Calterm 66331 Tru-Spark Ignition LED Indicator, Adjustable Sensitivity, Green, Red by calterm
- **How much does it cost?** $U82 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.uy](https://www.desertcart.uy/products/780508627-calterm-66331-tru-spark-ignition-led-indicator-adjustable-sensitivity-green)

## Best For

- calterm enthusiasts

## Why This Product

- Trusted calterm brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Non-Invasive Testing:** Diagnose ignition issues without piercing or removing spark plug wires—fast, safe, and efficient.
- • **Dual LED Feedback System:** Instant visual confirmation with green and red LEDs for reliable diagnostics every time.
- • **Rugged Shop-Ready Design:** Heavy-duty, oil-resistant ABS housing built to withstand harsh workshop environments.
- • **Precision Sensitivity Control:** Fine-tune detection to eliminate false signals and isolate specific plug wires effortlessly.
- • **Universal Ignition Compatibility:** Seamlessly works with both DIS and traditional ignition systems for versatile troubleshooting.

## Overview

The Calterm 66331 Tru-Spark Ignition LED Indicator is a precision electrical testing tool featuring an adjustable sensitivity dial and dual LED indicators to ensure accurate ignition system diagnostics. Its durable, oil-resistant ABS housing is designed for tough workshop conditions, compatible with both DIS and traditional ignition systems, enabling non-invasive, efficient troubleshooting without wire damage.

## Description

Effective use of test equipment, proper installation of electrical equipment and safe operation. A bad installation may be fatal; the condition of electrical equipment can be established when the contractor is using the test equipment. Calterm offers innovative, full-featured testing equipment designed to make electrical work fast and safe. Quickly and accurately test DIS and other ignition systems with secondary voltage without piercing or removing spark plug wires. Perfect for "no start" troubleshooting

## Features

- Sensitivity adjustment dial is a Calterm unique feature that allows for separation of specific plug wires and eliminates false signals from wires routed in proximity
- Green LED indicates tester and battery are working properly
- Red LED flashes every time voltage is released from the coil through the spark plug wire
- Heavy-duty, impact-resistant ABS housing is oil resistant and can withstand the condition of the shop
- Works with DIS and traditional ignition systems

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Calterm |
| Brand | Calterm |
| Model | 66331 |
| Product Dimensions | 5.59 x 14.99 x 3.56 cm; 18 g |
| Item model number | 66331 |
| Is Discontinued By Manufacturer | No |
| Item Dimensions  L x W x H | 5.6 x 15 x 3.6 cm |
| Color | red |
| Item Weight | 18 g |

## Product Details

- **Brand:** Calterm
- **Power Source:** Battery Powered
- **Style:** Modern
- **Color:** red
- **Item dimensions L x W x H:** 5.6 x 15 x 3.6 cm

## Images

![Calterm 66331 Tru-Spark Ignition LED Indicator, Adjustable Sensitivity, Green, Red - Image 1](https://m.media-amazon.com/images/I/71R5oKpSNAL.jpg)
![Calterm 66331 Tru-Spark Ignition LED Indicator, Adjustable Sensitivity, Green, Red - Image 2](https://m.media-amazon.com/images/I/71e2wcEolPL.jpg)
![Calterm 66331 Tru-Spark Ignition LED Indicator, Adjustable Sensitivity, Green, Red - Image 3](https://m.media-amazon.com/images/I/71JaUL5uNJL.jpg)
![Calterm 66331 Tru-Spark Ignition LED Indicator, Adjustable Sensitivity, Green, Red - Image 4](https://m.media-amazon.com/images/I/819anuVXdGL.jpg)

## Questions & Answers

**Q: Does clamp on?**
A: 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

**Q: does it work on small engine 4-cycle, 12V**
A: 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.

**Q: does this actually detect if the plug wire is pulled loose from the plug itself?**
A: 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.

**Q: Will this work on fuel injectors ?**
A: No- Just  ignitions. Fuel injectors are low voltage.

## Frequently Bought Together

- Calterm 66331 Tru-Spark Ignition Firing LED Indicator, Adjustable Sensitivity, Green,Red
- Lisle 19380 Spark Tester
- allsun Automotive Spark Ignition Tester 6-24V Pen Engine Indicator Spark Plug Car Wires Coils Diagnostic Tool Auto Voltage Cable Detector Small Engine Tools

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.uy/products/780508627-calterm-66331-tru-spark-ignition-led-indicator-adjustable-sensitivity-green](https://www.desertcart.uy/products/780508627-calterm-66331-tru-spark-ignition-led-indicator-adjustable-sensitivity-green)

---

*Product available on Desertcart Uruguay*
*Store origin: UY*
*Last updated: 2026-02-23*