--- product_id: 281802038 title: "Klein Tools ET40 Digital AC/DC Voltage Tester, 12-240V AC, 1.5-24V DC, LED Illumination, DC Polarity, Auto Off, CATIII 250V-Class 2- Double Insulation, IP4 Dust and Water Resistant" brand: "klein tools" price: "€ 69.02" currency: EUR in_stock: true reviews_count: 5 url: https://www.desertcart.de/products/281802038-klein-tools-et40-digital-ac-dc-voltage-tester-12-240v store_origin: DE region: Germany --- # 12-240V AC range LED voltage level indicators 1.5-24V DC detection Klein Tools ET40 Digital AC/DC Voltage Tester, 12-240V AC, 1.5-24V DC, LED Illumination, DC Polarity, Auto Off, CATIII 250V-Class 2- Double Insulation, IP4 Dust and Water Resistant **Brand:** klein tools **Price:** € 69.02 **Availability:** ✅ In Stock ## Summary > ⚡ Test Smarter, Work Safer — The Voltage Tester Pros Trust! ## Quick Answers - **What is this?** Klein Tools ET40 Digital AC/DC Voltage Tester, 12-240V AC, 1.5-24V DC, LED Illumination, DC Polarity, Auto Off, CATIII 250V-Class 2- Double Insulation, IP4 Dust and Water Resistant by klein tools - **How much does it cost?** € 69.02 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.de](https://www.desertcart.de/products/281802038-klein-tools-et40-digital-ac-dc-voltage-tester-12-240v) ## Best For - klein tools enthusiasts ## Why This Product - Trusted klein tools brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Polarity Detection:** Instantly identifies DC polarity to prevent costly wiring mistakes and ensure professional-grade troubleshooting. - • **Smart LED Illumination:** Bright LEDs instantly reveal voltage type and level, eliminating guesswork in dim or tight spaces. - • **Durability Meets Safety:** Built to survive 3-meter drops with CATIII 250V double insulation and IP4 dust/water resistance for rugged jobsite reliability. - • **Precision Voltage Range:** Accurately tests AC voltages from 12V to 240V and DC voltages from 1.5V to 24V, covering all common residential needs. - • **Energy Efficient Auto-Off:** Conserves battery life with automatic shutdown after 2 minutes of inactivity—ready when you are, no wasted power. ## Overview The Klein Tools ET40 Digital AC/DC Voltage Tester is a compact, professional-grade tool designed for precise residential voltage testing. It covers a broad AC range (12-240V) and sensitive DC detection (1.5-24V), features bright LED indicators for quick readings, and includes safety certifications like CATIII 250V and double insulation. Built tough to withstand drops and resist dust and water, it’s engineered for durability and accuracy on every job. ## Description Klein Tools ET40 is an Electronic AC/DC Voltage Tester. It features indicators for positive and negative DC polarity, and tests DC voltages as low as 1.5V. It tests AC voltages 12-240VAC. Excellent for checking, verifying or troubleshooting common residential electrical wiring in electrical outlets, light fixtures, doorbells and more. It operates on 2 x AAA batteries. For more than 160 years, Klein Tools has manufactured premium-quality, professional-grade hand tools that deliver the performance, durability and precision needed to get the job done right. Our family of engineers, workers and craftsman continue to put six generations of expertise into every tool we create by using only the highest quality materials, superior workmanship, and keeping manufacturing as close to home as we can. Klein isn't just the name of our company, it's also our family name. And since we're an American company that's family-owned and family-run, you know you can count on us to be here tomorrow. Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day ... Since 1857. ## Features - Voltage Tester for AC voltages from 12V to 240V AC at four useful levels aligned with commonly used residential voltages - Tests DC voltages from 1.5V to greater than 17 to 24V at four useful levels aligned with commonly used DC voltages - Bright LEDs illuminate to indicate the type and level of voltage detected - Built to withstand a 9.8-Foot (3 m) drop - Indicates polarity when measuring DC voltages.Powers off automatically after approximately 2 minutes of non-use to conserve battery life.CATIII 250V, Class 2, Double insulation ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B07P45RB8S | | Batteries | 2 AAA batteries required. (included) | | Best Sellers Rank | #90 in Voltage Testers | | Date First Available | 12 February 2019 | | Department | Unisex Adult | | Is Discontinued By Manufacturer | No | | Item Model Number | ET40 | | Manufacturer | KLEIN TOOLS | | Product Dimensions | 13.31 x 3.86 x 2.82 cm; 65.2 g | ## Product Details - **Brand:** KLEIN TOOLS - **Colour:** Orange - **Item weight:** 2.3 Ounces - **Power source:** Battery Powered - **Style:** 12/240 V ## Images ![Klein Tools ET40 Digital AC/DC Voltage Tester, 12-240V AC, 1.5-24V DC, LED Illumination, DC Polarity, Auto Off, CATIII 250V-Class 2- Double Insulation, IP4 Dust and Water Resistant - Image 1](https://m.media-amazon.com/images/I/612T16OUlgL.jpg) ![Klein Tools ET40 Digital AC/DC Voltage Tester, 12-240V AC, 1.5-24V DC, LED Illumination, DC Polarity, Auto Off, CATIII 250V-Class 2- Double Insulation, IP4 Dust and Water Resistant - Image 2](https://m.media-amazon.com/images/I/71b-OhkYo9L.jpg) ![Klein Tools ET40 Digital AC/DC Voltage Tester, 12-240V AC, 1.5-24V DC, LED Illumination, DC Polarity, Auto Off, CATIII 250V-Class 2- Double Insulation, IP4 Dust and Water Resistant - Image 3](https://m.media-amazon.com/images/I/71lkrjsuFRL.jpg) ![Klein Tools ET40 Digital AC/DC Voltage Tester, 12-240V AC, 1.5-24V DC, LED Illumination, DC Polarity, Auto Off, CATIII 250V-Class 2- Double Insulation, IP4 Dust and Water Resistant - Image 4](https://m.media-amazon.com/images/I/81MAM7MpDuL.jpg) ![Klein Tools ET40 Digital AC/DC Voltage Tester, 12-240V AC, 1.5-24V DC, LED Illumination, DC Polarity, Auto Off, CATIII 250V-Class 2- Double Insulation, IP4 Dust and Water Resistant - Image 5](https://m.media-amazon.com/images/I/71bUQjl6qsL.jpg) ## Available Options This product comes in different **Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ It is absolutely necessary and perfect. *by on Reviewed in the United Kingdom 7 July 2023* This voltage tester was a must have for me. I feel more at ease putting my trust in this product than I do a voltage pen, therefore since I lost my previous tester I purchased this affordable one. Absolutely perfect for checking safe isolation and betteries. Very please with this handy pocket tester. ### ⭐⭐⭐⭐⭐ Good Klein quality *by on Reviewed in Canada 9 August 2025* Good voltage safety tool. ### ⭐⭐⭐⭐⭐ beau produit *by on Reviewed in Canada 24 December 2025* lecteur facile d'utilisation et très bien fait ## Frequently Bought Together - Klein Tools ET40 Digital AC/DC Voltage Tester, 12-240V AC, 1.5-24V DC, LED Illumination, DC Polarity, Auto Off, CATIII 250V-Class 2- Double Insulation, IP4 Dust and Water Resistant - Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles - IDEAL Electrical 45-025 Lil Ripper Stripper Wire Stripper w/ Slitting Blade, V-Notch, Flat Blade Clip --- ## 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.de/products/281802038-klein-tools-et40-digital-ac-dc-voltage-tester-12-240v](https://www.desertcart.de/products/281802038-klein-tools-et40-digital-ac-dc-voltage-tester-12-240v) --- *Product available on Desertcart Germany* *Store origin: DE* *Last updated: 2026-09-06*