---
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: "KD 0.90"
currency: KWD
in_stock: true
reviews_count: 5
category: "Klein Tools"
url: https://www.desertcart.com.kw/products/281802038-klein-tools-et40-digital-ac-dc-voltage-tester-12-240v
store_origin: KW
region: Kuwait
---

# 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:** KD 0.90
**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?** KD 0.90 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.kw](https://www.desertcart.com.kw/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

- • **Built to Last:** Withstands drops up to 3 meters and features double insulation plus CATIII 250V safety rating for professional durability.
- • **Polarity Clarity:** Instant DC polarity indication ensures you never second-guess wiring direction—boosting safety and confidence on every job.
- • **Illuminated Insight:** Bright LEDs clearly display voltage type and level, even in dimly lit spaces—because your work deserves clarity.
- • **Smart Power Management:** Auto-off after 2 minutes conserves battery life so your tester is ready when you are—no wasted power, no surprises.
- • **Precision Voltage Detection:** Accurately tests AC from 12V to 240V and DC from 1.5V to 24V for all your residential and light commercial needs.

## Overview

The Klein Tools ET40 Digital AC/DC Voltage Tester is a professional-grade tool designed for precise voltage measurement from 12 to 240 volts AC and 1.5 to 24 volts DC. Featuring bright LED indicators, DC polarity detection, and robust construction with double insulation and CATIII 250V safety rating, it’s built to endure drops up to 3 meters. Auto power-off extends battery life, making it an essential, reliable companion 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.

Review: 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: exactly what i need , fast easy and no batteries needed so i can leave it in the car in the winter

## 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) |
| Batteries  | 2 AAA batteries required. (included) |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Alkaline |
| Best Sellers Rank | #127,495 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #300 in Voltage Testers |
| Color | Orange |
| Customer Reviews | 4.5 4.5 out of 5 stars (1,568) |
| Customer reviews | 4.5 4.5 out of 5 stars (1,568) |
| Date First Available | 12 February 2019 |
| Date First Available  | 12 February 2019 |
| Department  | Unisex Adult |
| Display Style | Analog LED |
| Finish | Brushed |
| Included components | No|Tester, User Manual, and 2 x AAA Batteries |
| Is Discontinued By Manufacturer  | No |
| Item Package Quantity | 1 |
| Item Weight | 65.1 g |
| Item model number | ET40 |
| Item model number  | ET40 |
| Manufacturer | KLEIN TOOLS |
| Manufacturer  | KLEIN TOOLS |
| Material | Plastic Housing, PCB with Electronic Components |
| Measurement Accuracy | +/-0.5% |
| Part number | ET40 |
| Pattern | Solid |
| Power source type | Battery Powered |
| Product Dimensions | 13.31 x 3.86 x 2.82 cm; 65.2 g |
| Product Dimensions  | 13.31 x 3.86 x 2.82 cm; 65.2 g |
| Shape | Rectangular |
| Size | One Size |
| Special Features | DC Polarity Indicators for DC Positive, DC Negative, and Both Illuminated for AC. Tests Low DC Voltage to 1.5V. Built in Test Lead Holders on Sides of Tester. |
| Specification met | CE |
| Style | 12/240 V |
| tech_spec_battery_description_toys | 2 x AAA |

## 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/41NjGvOHiqL.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/41UnWhlH+DL.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/41eSRWuETPL.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/41hvJ2fxxjL.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/516B2lw4sdL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*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.

### ⭐⭐⭐⭐⭐ Review
*by S***D on 6 November 2025*

exactly what i need , fast easy and no batteries needed so i can leave it in the car in the winter

### ⭐⭐⭐⭐⭐ Review
*by R***G on 6 September 2025*

This has been such an easy, accurate to and best for beginners!!

## 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
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*Product available on Desertcart Kuwait*
*Store origin: KW*
*Last updated: 2026-02-12*