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⚡ Test smarter, work safer — Klein Tools ET40 keeps you powered up and ahead.
The Klein Tools ET40 Digital AC/DC Voltage Tester is a professional-grade tool designed for precise residential voltage testing from 12 to 240V AC and 1.5 to 24V DC. Featuring bright LED indicators, DC polarity detection, and robust drop resistance, it ensures reliable, safe diagnostics with auto power-off to extend battery life. Trusted by pros since 1857, this compact, battery-powered tester is engineered for durability and accuracy in any electrical troubleshooting scenario.












| ASIN | B07P45RB8S |
| ASIN | B07P45RB8S |
| Batteries | 2 AAA batteries required. (included) |
| Best Sellers Rank | #61,004 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #124 in Voltage Testers |
| Brand Name | KLEIN TOOLS |
| Color | Orange |
| Customer Reviews | 4.5 4.5 out of 5 stars (1,643) |
| Customer reviews | 4.5 4.5 out of 5 stars (1,643) |
| 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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