--- product_id: 281802038 title: "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: "$39.02" currency: USD in_stock: true reviews_count: 5 category: "Klein Tools" url: https://www.desertcart.us/products/281802038-et40-digital-ac-dc-voltage-tester-12-240v-ac-1 store_origin: US region: United States of America --- # 12-240V AC range LED voltage level indicators 1.5-24V DC detection 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:** $39.02 **Availability:** ✅ In Stock ## Summary > ⚡ Stay powered, stay precise — the pro’s pocket voltage guardian! ## Quick Answers - **What is this?** 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?** $39.02 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/281802038-et40-digital-ac-dc-voltage-tester-12-240v-ac-1) ## 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 Awareness:** Clear DC polarity indication empowers confident troubleshooting and safer electrical work every time. - • **Smart LED Illumination:** Bright LEDs instantly reveal voltage type and level, ensuring you never miss a detail in dim or tight spaces. - • **Durability Meets Safety:** Built to survive 3m drops with CATIII 250V double insulation and IP4 dust/water resistance for rugged jobsite reliability. - • **Energy Efficient Auto-Off:** Automatic power-off after 2 minutes conserves battery life, so your tester is ready when you are. - • **Precision Voltage Detection:** Accurately tests AC voltages from 12V to 240V and DC voltages as low as 1.5V for flawless diagnostics. ## Overview The Klein Tools ET40 Digital Voltage Tester is a compact, professional-grade device designed for accurate AC/DC voltage measurement from 1.5V to 240V. Featuring bright LED indicators, DC polarity detection, and rugged construction with drop resistance and double insulation, it’s optimized for residential and light commercial electrical troubleshooting. Auto power-off extends battery life, making it an indispensable tool for millennial managers who demand precision, durability, and efficiency 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. Review: It is absolutely necessary and perfect. - 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. Review: Good Klein quality - Good voltage safety tool. ## 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 | | Best Sellers Rank | #34,709 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #68 in Voltage Testers | | Brand | KLEIN TOOLS | | Brand Name | KLEIN TOOLS | | Color | Orange | | Colour | Orange | | Customer Reviews | 4.5 out of 5 stars 1,640 Reviews | | Global Trade Identification Number | 00092644691836 | | Included Components | No|Tester, User Manual, and 2 x AAA Batteries | | 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 dimensions L x W x H | 13.3 x 3.9 x 2.8 centimeters | | Item weight | 2.3 Ounces | | Manufacturer | KLEIN TOOLS | | Maximum Operating Voltage | 240 Volts | | Measurement Type | Voltmeter | | Minimum Operating Voltage | 1.5 Volts | | Model | ET40 | | Number of Items | 1 | | Part Number | ET40 | | Power Source | Battery Powered | | Power source | Battery Powered | | Specification Met | CE | | Style | 12/240 V | | 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 ![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) ## Available Options This product comes in different **Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ It is absolutely necessary and perfect. *by J***S on 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 R***0 on 9 August 2025* Good voltage safety tool. ### ⭐⭐⭐⭐⭐ beau produit *by R***J on 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.us/products/281802038-et40-digital-ac-dc-voltage-tester-12-240v-ac-1](https://www.desertcart.us/products/281802038-et40-digital-ac-dc-voltage-tester-12-240v-ac-1) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-09-02*