---
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: "€ 49.12"
currency: EUR
in_stock: true
reviews_count: 5
category: "Klein Tools"
url: https://www.desertcart.it/products/281802038-klein-tools-et40-digital-ac-dc-voltage-tester-12-240v
store_origin: IT
region: Italy
---

# 12-240V AC range LED voltage illumination 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:** € 49.12
**Availability:** ✅ In Stock

## Summary

> ⚡ Illuminate your workflow with precision and power!

## 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?** € 49.12 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/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 wiring errors and ensure safe, professional-grade troubleshooting.
- • **Smart LED Indicators:** Bright LEDs instantly reveal voltage type and level, making diagnostics faster and more intuitive—even in low light.
- • **Durability Meets Safety:** Built to survive 3-meter drops with CATIII 250V double insulation and IP4 dust/water resistance for reliable field performance.
- • **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:** Conserves battery life with automatic shutoff after 2 minutes of inactivity—ready when you are, without wasting power.

## Overview

The Klein Tools ET40 Digital AC/DC Voltage Tester is a compact, rugged device designed for professionals and serious DIYers. It accurately measures AC voltages from 12 to 240 volts and DC voltages from 1.5 to 24 volts, with bright LED indicators for quick voltage type and level identification. Engineered for durability, it withstands 3-meter drops and meets CATIII 250V safety standards with double insulation and IP4 dust/water resistance. Additional features include DC polarity detection and an auto-off function to extend battery life, making it an essential tool for residential electrical troubleshooting and verification.

## 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.
Review: works great

## 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 | #139,062 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #329 in Voltage Testers |
| Brand | KLEIN TOOLS |
| Brand Name | KLEIN TOOLS |
| Color | Orange |
| Colour | Orange |
| Customer Reviews | 4.5 out of 5 stars 1,570 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 |
| Power Source | Battery Powered |
| Power source | Battery Powered |
| Specification Met | CE |
| Style | 12/240 V |
| Style Name | 12/240 V |
| UPC | 092644691836 |
| Unit Count | 1 Count |

## 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)

## Available Options

This product comes in different **Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ It is absolutely necessary and perfect.
*by J***S on 7 July 2023*



### ⭐⭐⭐⭐⭐ works great
*by S***D on 6 November 2025*



### ⭐⭐⭐⭐⭐ Small and handy
*by R***N on 23 July 2025*



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*Product available on Desertcart Italy*
*Store origin: IT*
*Last updated: 2026-02-17*