--- product_id: 7531859 title: "Calterm 66331 Tru-Spark Ignition Firing LED Indicator, Adjustable Sensitivity, Green,Red" brand: "calterm" price: "฿2422" currency: THB in_stock: true reviews_count: 13 category: "Calterm" url: https://www.desertcart.co.th/products/7531859-calterm-66331-tru-spark-ignition-firing-led-indicator-adjustable-sensitivity store_origin: TH region: Thailand --- # 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:** ฿2422 **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?** ฿2422 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/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 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: Works great - Great tool Review: Quick and Reliable Spark Plugs, Cables and Ignition Tester - Quick and reliable Spark Plugs, Cables and Ignition Tester. We use these daily to verify spark plugs, cables and ignition fault codes from OBDII scanner before inspection and removing from engine. Easy to use and good value. Sensitivity dial is a little loose so it is important to test and experiment with different settings for domestic and import cars. ## 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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works great *by H***D on December 6, 2025* Great tool ### ⭐⭐⭐⭐⭐ Quick and Reliable Spark Plugs, Cables and Ignition Tester *by S***5 on January 8, 2021* Quick and reliable Spark Plugs, Cables and Ignition Tester. We use these daily to verify spark plugs, cables and ignition fault codes from OBDII scanner before inspection and removing from engine. Easy to use and good value. Sensitivity dial is a little loose so it is important to test and experiment with different settings for domestic and import cars. ### ⭐⭐⭐⭐⭐ Easy to use. *by S***E on May 20, 2024* This is the second one of these that I've had. I should have never let a co-worker borrow the first one. He quit and I never got it back. It's a nice little unit for testing to see if you have a plug that's firing like it should. It has a a clip so can stick it in your pocket. A thumb wheel that you can turn the sensitivity setting up or down with. The pocket clip acts as an on switch. Just hold it down and the green light comes on. Put it next to a plug wire or a coil tower or a spark plug boot. And if getting spark. The green light will pulse red every time it fires. The top part of the pocket clip hold in the three coin batteries that makes it work. The first one I had the batteries lasted for a long time. (several years) Fairly rugged. Had mine fall out of my pocket onto a concrete floor many times and it never effected the way it worked. Handy device that I feel is well worth the money. ## 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.co.th/products/7531859-calterm-66331-tru-spark-ignition-firing-led-indicator-adjustable-sensitivity](https://www.desertcart.co.th/products/7531859-calterm-66331-tru-spark-ignition-firing-led-indicator-adjustable-sensitivity) --- *Product available on Desertcart Thailand* *Store origin: TH* *Last updated: 2026-04-24*