--- product_id: 501421999 title: "Test Light Automotive Power Circuit Probe Tester with 4M Test Lead 6-24V DC Led Light Tester Fuse Tester 6V 12V 24V Wire Circuit Tester Auto 12 Volt Electrical System Tools Car Truck Circuit Test Pen" brand: "cmtool" price: "€ 33.17" currency: EUR in_stock: true reviews_count: 5 url: https://www.desertcart.pt/products/501421999-test-light-automotive-power-circuit-probe-tester-with-4m-test store_origin: PT region: Portugal --- # LED polarity & continuity indicators with buzzer alerts 4M extended test lead for full vehicle reach 6-24V DC compatibility for versatile automotive use Test Light Automotive Power Circuit Probe Tester with 4M Test Lead 6-24V DC Led Light Tester Fuse Tester 6V 12V 24V Wire Circuit Tester Auto 12 Volt Electrical System Tools Car Truck Circuit Test Pen **Brand:** cmtool **Price:** € 33.17 **Availability:** ✅ In Stock ## Summary > ⚡ Diagnose Like a Pro, Drive with Confidence! ## Quick Answers - **What is this?** Test Light Automotive Power Circuit Probe Tester with 4M Test Lead 6-24V DC Led Light Tester Fuse Tester 6V 12V 24V Wire Circuit Tester Auto 12 Volt Electrical System Tools Car Truck Circuit Test Pen by cmtool - **How much does it cost?** € 33.17 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/501421999-test-light-automotive-power-circuit-probe-tester-with-4m-test) ## Best For - cmtool enthusiasts ## Why This Product - Trusted cmtool brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Built Tough for the Road:** Durable ABS casing resists moisture, heat, and impact for long-lasting reliability. - • **Smart Safety with Auto Trip:** Overload protection trips at 7A with buzzer warning, keeping you and your vehicle safe. - • **Extended Reach, Maximum Access:** 4-meter test lead lets you diagnose every corner of your vehicle with ease. - • **Universal Voltage Compatibility:** Works seamlessly across 6V, 12V, and 24V automotive electrical systems. - • **Instant Polarity & Continuity Feedback:** Dual-color LED and buzzer alerts ensure you never miss a faulty wire or connection. ## Overview The Test Light Automotive Power Circuit Probe Tester is a rugged, multifunctional diagnostic tool designed for 6-24V automotive electrical systems. Featuring a 4-meter test lead, dual-color LED indicators, buzzer alerts, and built-in overload protection, it enables quick polarity, continuity, and grounding tests. Crafted from impact-resistant ABS plastic, this tester is perfect for mechanics and car enthusiasts seeking reliable, precise circuit troubleshooting on cars and trucks. ## Description Automotive Circuit Tester ## Features - 1. Portable Multifunctional Electrical Tester The 4-meter extension cord is helpful for mobile maintece work and is suitable for diagnostics of all 6V to 24V automotive electrical systems. The tester is made of ABS material, which is moisture-proof, high-temperature resistant, impact-resistant and has a longer service life. The tester also has an overload protection device, When the current exceeds 7A, the circuit breaker inside the device will automatically trip and give out a buzzer prompt. - 2. Polarity Test and Continuity Test The tester is made of insulating material and high-quality stainless steel, which can help you quickly identify the positive and negative polarity of the vehicle cable and plug. When the tester touches the positive pole, the LED should be red; when it touches the negative pole, the LED should be GREEN. The electric circuit tester is also used to check the continuity of switches, relays, diodes, fuses, and circuits. - 3. Component Activation and Testing For professionals or car enthusiasts, this continuity tester is a great tool. The automotive short circuit tester can activate the components in/out of the vehicle's electrical system. The LED indicator and buzzer prompt can easily test and check whether the components are defective, or whether the rated current of the component is higher than the rated current of the tester. - 4. Automotive Circuit Tester for Grounding Test The design of the circuit breaker finder is perfectly designed and feels comfortable. It is equipped with a 4M extended detection line, covering the front to the rear of the vehicle and easily detecting the entire vehicle circuit system. The automotive circuit tester kit has a grounding prompt device. If the LED indicator turns green and the buzzer sounds, it means that the grounding is good. If it is not, the LED remains red and there is no beep. - 5. Tracking and Locating Short Circuits The electrical tester uses advanced high-sensitivity probes to provide you with fast and accurate detection. Using the continuity tester can save a lot of time to troubleshoot the car wiring circuit, to quickly and accurately find the faulty wire and its fault point..6. 24-Hour Service and 1-Year Warranty We provide this circuit probe tester with 24 hours friendly customer service and 12 months free warranty to ensure your shopping experience. ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B09CL7ZDZ5 | | Best Sellers Rank | #109 in Circuit Testers | | Country Of Origin | China | | Date First Available | 15 September 2023 | | Item Model Number | AY-29 | | Manufacturer | CMTOOL | | Package Dimensions | 27.2 x 9.8 x 4.19 cm; 331 g | ## Product Details - **Brand:** CMTOOL - **Colour:** Green,red - **Item weight:** 0.33 Kilograms - **Power source:** Cable Electric - **Style:** Power Circuit Probe Tester ## Images ![Test Light Automotive Power Circuit Probe Tester with 4M Test Lead 6-24V DC Led Light Tester Fuse Tester 6V 12V 24V Wire Circuit Tester Auto 12 Volt Electrical System Tools Car Truck Circuit Test Pen - Image 1](https://m.media-amazon.com/images/I/61RyWupGTNL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Excelente producto *by on Reviewed in the United States 12 September 2026* Excelente producto ### ⭐⭐⭐⭐⭐ Good product, as described *by on Reviewed in Canada 10 November 2023* Good product, as described ### ⭐⭐⭐⭐⭐ Worth it *by on Reviewed in the United States 30 September 2025* Pay for what you get! No breaker on the device. Small palm sized. Saves a ton of time. I’ve dropped it and used it in the field a lot, probably 20 days in the field and it still works fine aven though it’s been tossed into tools bags and had stuff piled up on it.Worth every penny ## Frequently Bought Together - CMTOOL Power Circuit Probe Tester 6V-24V DC Test Light, Automotive Circuit Tester Car Short Finder, Component Activation, Polarity Identify, Overload Protection - WINAMOO Automotive Test Light with 3-48V LED Digital Voltage Display, Auto Circuit Tester with Voltmeter & Dual Color Polarity Indicate, Electric Test Pen w/Stainless Probe for Car/Truck/SUV Checker - JOREST 300Pcs Car Fuse Assortment Kit, 160 Mini Blade Fuses Automotive + 90 Standard Auto Fuses + 50 Micro + Puller – Replacement for RV Camper Boat Truck (2Amp 3A 5A 7.5A 10A 15A 20A 25A 30A 35A 40A) --- ## 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.pt/products/501421999-test-light-automotive-power-circuit-probe-tester-with-4m-test](https://www.desertcart.pt/products/501421999-test-light-automotive-power-circuit-probe-tester-with-4m-test) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-11-08*