---
product_id: 341059989
title: "66331 Tru-Spark Ignition Firing LED Indicator, Adjustable Sensitivity"
brand: "calterm"
price: "4941 som"
currency: KGS
in_stock: true
reviews_count: 5
category: "Calterm"
url: https://www.desertcart.kg/products/341059989-66331-tru-spark-ignition-firing-led-indicator-adjustable-sensitivity
store_origin: KG
region: Kyrgyzstan
---

# Dual LED indicators for real-time status feedback Adjustable sensitivity dial for pinpoint accuracy Rugged ABS housing resists oil & shop wear 66331 Tru-Spark Ignition Firing LED Indicator, Adjustable Sensitivity

**Brand:** calterm
**Price:** 4941 som
**Availability:** ✅ In Stock

## Summary

> ⚡ Ignite your diagnostics with precision and confidence!

## Quick Answers

- **What is this?** 66331 Tru-Spark Ignition Firing LED Indicator, Adjustable Sensitivity by calterm
- **How much does it cost?** 4941 som with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/products/341059989-66331-tru-spark-ignition-firing-led-indicator-adjustable-sensitivity)

## 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

- • **Instant Visual Feedback:** Green LED confirms tester readiness; red LED flashes with each ignition pulse for clear, immediate insights.
- • **Universal Compatibility:** Seamlessly tests both DIS and conventional ignition systems without wire piercing or removal.
- • **Durable Shop-Ready Design:** High-impact ABS casing withstands harsh automotive environments, ensuring longevity and reliability.
- • **Faster, Safer Troubleshooting:** Quickly identify ignition faults to reduce downtime and avoid costly misdiagnoses.
- • **Precision Sensitivity Control:** Exclusive dial isolates specific plug wires, eliminating false signals and boosting diagnostic confidence.

## Overview

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 for clear operational and ignition status, it’s housed in rugged ABS to endure tough shop conditions. Compatible with both DIS and conventional ignition systems, this battery-powered tester enables fast, non-invasive troubleshooting to keep your vehicle ignition diagnostics sharp and reliable.

## Description

Testing equipment can be put to good use ensuring that electrical equipment is properly installed and safe to operate. Faulty installations can be lethal; the condition of electrical installations can be established when contractors use test equipment. Calterm is please to offer an innovative full feature line of test equipment designed to make electrical work faster and safer. Quickly and accurately test DIS and other ignition systems for the presence of secondary voltage without piercing or removing spark plug wires. Great for troubleshooting 'no-starts'.

Review: Good
Review: Works great

## Features

- SENSITIVITY ADJUSTMENT DIAL is a Calterm EXCLUSIVE feature that allows isolation of a specific plug wire and eliminates false signals from wires routed in close proximity.
- Green LED indicates that the tester and batteries are operating properly.
- Red LED flashes each time voltage is released from the coil through the spark plug wire.
- Rugged high impact ABS housing resists oil and endures shop conditions.
- Works with DIS and conventional ignition systems.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000JFHMPC |
| Best Sellers Rank | #68,969 in Automotive ( See Top 100 in Automotive ) #10 in Automotive Ignition Testers |
| Brand | Calterm |
| Brand Name | Calterm |
| Color | Red |
| Colour | Red |
| Country Of Origin | China |
| Customer Reviews | 4.2 out of 5 stars 349 Reviews |
| Global Trade Identification Number | 00046494020230 |
| Item Dimensions | 5.6 x 15 x 3.6 centimeters |
| Item Type Name | LED Indicator |
| Item dimensions L x W x H | 5.6 x 15 x 3.6 centimeters |
| Item height | 1.4 inches |
| Manufacturer | Calterm |
| Measurement Type | Voltage |
| Model | 66331 |
| Power Source | Battery Powered |
| Power source | Battery Powered |
| Specification Met | CE, ETL, RoHS, UL |
| Specification met | CE, ETL, RoHS, UL |
| Style | Modern |
| Style Name | Modern |
| UPC | 971473127474 046494020230 521227771189 956257381846 |
| Unit Count | 1 Count |

## Product Details

- **Brand:** Calterm
- **Power source:** Battery Powered
- **Style:** Modern
- **Colour:** Green,Red
- **Item dimensions L x W x H:** 5.6 x 15 x 3.6 centimeters

## Images

![66331 Tru-Spark Ignition Firing LED Indicator, Adjustable Sensitivity - Image 1](https://m.media-amazon.com/images/I/71R5oKpSNAL.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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good
*by A***R on 21 July 2024*



### ⭐⭐⭐⭐⭐ Works great
*by H***D on 6 December 2025*



### ⭐⭐⭐⭐⭐ Handy tool
*by D***S on 10 May 2019*



## Frequently Bought Together

- Calterm 66331 Tru-Spark Ignition Firing LED Indicator, Adjustable Sensitivity, Green,Red
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**Shop now:** [https://www.desertcart.kg/products/341059989-66331-tru-spark-ignition-firing-led-indicator-adjustable-sensitivity](https://www.desertcart.kg/products/341059989-66331-tru-spark-ignition-firing-led-indicator-adjustable-sensitivity)

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*Product available on Desertcart Kyrgyzstan*
*Store origin: KG*
*Last updated: 2026-01-31*