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⚡ Stay powered, stay precise — the pro’s voltage tester you can’t afford to miss!
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 easy reading. Featuring polarity detection, drop resistance up to 3 meters, and safety certifications including CATIII 250V and double insulation, it’s built to last on the job. Auto-off functionality conserves battery life, making it a reliable, must-have tool for electrical troubleshooting and verification.












| ASIN | B07P45RB8S |
| ASIN | B07P45RB8S |
| Batteries | 2 AAA batteries required. (included) |
| Best Sellers Rank | #67,197 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #143 in Voltage Testers |
| Brand Name | KLEIN TOOLS |
| Color | Orange |
| Customer Reviews | 4.5 4.5 out of 5 stars (1,645) |
| Customer reviews | 4.5 4.5 out of 5 stars (1,645) |
| 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 |
| Number of Items | 1 |
| 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 |
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