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⚡ Test Smarter, Work Safer — The Voltage Tester That Means Business
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 for voltage level and polarity, rugged drop resistance, and CATIII 250V safety rating, it combines durability with smart energy-saving auto-off functionality. Compact and battery-powered, it’s engineered for electricians and managers who demand accuracy, safety, and efficiency on every job.












| ASIN | B07P45RB8S |
| ASIN | B07P45RB8S |
| Batteries | 2 AAA batteries required. (included) |
| Best Sellers Rank | #65,478 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #137 in Voltage Testers |
| Brand Name | KLEIN TOOLS |
| Color | Orange |
| Customer Reviews | 4.5 4.5 out of 5 stars (1,644) |
| Customer reviews | 4.5 4.5 out of 5 stars (1,644) |
| 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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