---
product_id: 7531859
title: "Calterm 66331 Tru-Spark Ignition Firing LED Indicator, Adjustable Sensitivity, Green,Red"
brand: "calterm"
price: "R$428"
currency: BRL
in_stock: true
url: https://www.desertcart.com.br/products/7531859-calterm-66331-tru-spark-ignition-firing-led-indicator-adjustable-sensitivity
store_origin: BR
region: Brazil
---

# Adjustable sensitivity dial for precision Durable ABS housing resists oil & impact Dual LED indicators for real-time status Calterm 66331 Tru-Spark Ignition Firing LED Indicator, Adjustable Sensitivity, Green,Red

**Brand:** calterm
**Price:** R$428
**Availability:** ✅ In Stock

## Summary

> ⚡ Never miss a spark—ignite your diagnostics with precision and confidence!

## Quick Answers

- **What is this?** Calterm 66331 Tru-Spark Ignition Firing LED Indicator, Adjustable Sensitivity, Green,Red by calterm
- **How much does it cost?** R$428 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/products/7531859-calterm-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

- • **Built to Endure:** Rugged high-impact ABS casing withstands harsh shop environments and oil exposure without fail.
- • **Compact & Lightweight:** At just 0.634 ounces and pocket-sized, it’s the perfect on-the-go ignition tester for busy technicians.
- • **Instant Visual Feedback:** Green LED confirms tester readiness; red LED flashes with each ignition spark for real-time monitoring.
- • **Universal Compatibility:** Seamlessly works with both DIS and conventional ignition systems, making it a versatile tool for pros.
- • **Pinpoint Ignition Accuracy:** Exclusive sensitivity dial isolates specific plug wires, eliminating false signals for flawless diagnostics.

## Overview

The Calterm 66331 Tru-Spark Ignition Firing LED Indicator is a compact, battery-powered tool featuring an exclusive adjustable sensitivity dial to isolate plug wires and prevent false signals. Equipped with green and red LEDs for clear operational and ignition feedback, it boasts a rugged ABS housing designed to resist oil and endure tough shop conditions. Compatible with both DIS and conventional ignition systems, this precision tester is engineered for professional-grade ignition diagnostics.

## Description

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

## 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 |
|---------------|-------|
| Brand | Calterm |
| Power Source | Battery Powered |
| Style | Adjustable |
| Color | Green,Red |
| Item dimensions L x W x H | 2.2 x 5.9 x 1.4 inches |
| Specification Met | CE, ETL, RoHS, UL |
| Measurement Type | Voltage |
| UPC | 971473127474 046494020230 521227771189 956257381846 |
| Manufacturer | Calterm |
| Global Trade Identification Number | 00046494020230 |
| Model | 66331 |
| Item Weight | 0.634 ounces |
| Product Dimensions | 2.2 x 5.9 x 1.4 inches |
| Item model number | 66331 |
| Is Discontinued By Manufacturer | No |
| Manufacturer Part Number | 66331 |

## Product Details

- **Brand:** Calterm
- **Power Source:** Battery Powered
- **Style:** Adjustable
- **Color:** Green,Red
- **Item dimensions L x W x H:** 2.2 x 5.9 x 1.4 inches

## Images

![Calterm 66331 Tru-Spark Ignition Firing LED Indicator, Adjustable Sensitivity, Green,Red - 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.

## 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

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**Shop now:** [https://www.desertcart.com.br/products/7531859-calterm-66331-tru-spark-ignition-firing-led-indicator-adjustable-sensitivity](https://www.desertcart.com.br/products/7531859-calterm-66331-tru-spark-ignition-firing-led-indicator-adjustable-sensitivity)

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*Product available on Desertcart Brazil*
*Store origin: BR*
*Last updated: 2026-01-22*