--- 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: "€ 81.27" currency: EUR in_stock: true category: "Klein Tools" url: https://www.desertcart.sk/products/281802038-klein-tools-et40-digital-ac-dc-voltage-tester-12-240v store_origin: SK region: Slovakia --- # 12-240V AC range Bright LED voltage 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:** € 81.27 **Availability:** ✅ In Stock ## Summary > ⚡ Test Smarter, Work Safer — The Voltage Tester That Means Business ## 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?** € 81.27 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/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 - • **Rugged Durability:** Engineered to survive 3-meter drops and rated CATIII 250V with double insulation for professional-grade safety and longevity. - • **Compact & Portable:** Lightweight and pocket-friendly design with included AAA batteries—your go-to tester for on-the-go troubleshooting. - • **Smart LED Illumination:** Bright, intuitive LEDs instantly reveal voltage presence and polarity, eliminating guesswork and boosting job-site confidence. - • **Precision Voltage Range:** Accurately tests AC voltages from 12V to 240V and DC voltages from 1.5V to 24V, covering all your residential and light commercial needs. - • **Energy Efficient Auto-Off:** Automatically powers down after 2 minutes of inactivity, preserving battery life so it’s ready when you are. ## Overview The Klein Tools ET40 Digital AC/DC Voltage Tester is a professional-grade, compact device designed for precise voltage detection from 12 to 240 volts AC and 1.5 to 24 volts DC. Featuring bright LED indicators for voltage level and polarity, it offers rugged durability with a 3-meter drop resistance and CATIII 250V safety rating. Its energy-saving auto-off function and pocket-sized portability make it an essential tool for electricians and savvy DIYers alike. ## 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 | | ASIN | B07P45RB8S | | Batteries | 2 AAA batteries required. (included) | | Best Sellers Rank | #153,258 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #356 in Voltage Testers | | Brand Name | KLEIN TOOLS | | Color | Orange | | Customer Reviews | 4.5 4.5 out of 5 stars (1,604) | | Customer reviews | 4.5 4.5 out of 5 stars (1,604) | | Date First Available | 12 February 2019 | | Department | Unisex Adult | | Global Trade Identification Number | 00092644691836 | | Included Components | No|Tester, User Manual, and 2 x AAA Batteries | | Is Discontinued By Manufacturer | No | | Item Dimensions | 13.3 x 3.9 x 2.8 centimeters | | Item Length | 5.24 Inches | | Item Type Name | Klein Tools ET40 Voltage Tester, AC Voltage, DC Voltage, and DC Polarity, Low Voltage Tester Includes Batteries | | Item Weight | 2.3 Ounces | | Item Width | 1.11 Inches | | Item model number | ET40 | | Manufacturer | KLEIN TOOLS | | Manufacturer | KLEIN TOOLS | | Maximum Operating Voltage | 240 Volts | | Measurement Type | Voltmeter | | Minimum Operating Voltage | 1.5 Volts | | Model | ET40 | | Part Number | ET40 | | Power Source | Battery Powered | | Product Dimensions | 13.31 x 3.86 x 2.82 cm; 65.2 g | | Specification Met | CE | | Style Name | 12/240 V | | UPC | 092644691836 | ## 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/51i2DA8X-sL.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/61+vAs+1wDL.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/71Y+J-v1F+L.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/516B2lw4sdL.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/51h-ok2UwuL.jpg) ## Available Options This product comes in different **Style** options. ## 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.sk/products/281802038-klein-tools-et40-digital-ac-dc-voltage-tester-12-240v](https://www.desertcart.sk/products/281802038-klein-tools-et40-digital-ac-dc-voltage-tester-12-240v) --- *Product available on Desertcart Slovakia* *Store origin: SK* *Last updated: 2026-05-12*