--- product_id: 341059989 title: "Calterm 66331 Tru-Spark Ignition Firing LED Indicator, Adjustable Sensitivity" brand: "calterm" price: "€ 54.90" currency: EUR in_stock: true category: "Calterm" url: https://www.desertcart.it/products/341059989-calterm-66331-tru-spark-ignition-firing-led-indicator-adjustable-sensitivity store_origin: IT region: Italy --- # Red LED flashes with each ignition pulse Adjustable sensitivity dial for pinpoint accuracy Rugged ABS housing resists oil & shop wear Calterm 66331 Tru-Spark Ignition Firing LED Indicator, Adjustable Sensitivity **Brand:** calterm **Price:** € 54.90 **Availability:** ✅ In Stock ## Summary > ⚡ Diagnose with precision, test with confidence! ## Quick Answers - **What is this?** Calterm 66331 Tru-Spark Ignition Firing LED Indicator, Adjustable Sensitivity by calterm - **How much does it cost?** € 54.90 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/341059989-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 - • **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. ## Overview 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. ## 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'. ## 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 | #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 | ## Product Details - **Brand:** Calterm - **Colour:** Red - **Item dimensions L x W x H:** 5.6 x 15 x 3.6 centimeters - **Power source:** Battery Powered - **Style:** Modern ## Images ![Calterm 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. ## 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.it/products/341059989-calterm-66331-tru-spark-ignition-firing-led-indicator-adjustable-sensitivity](https://www.desertcart.it/products/341059989-calterm-66331-tru-spark-ignition-firing-led-indicator-adjustable-sensitivity) --- *Product available on Desertcart Italy* *Store origin: IT* *Last updated: 2026-07-08*