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⚡ Test Smarter, Work Safer — The Voltage Tester That Keeps You 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 combines safety (CATIII 250V, double insulation) with smart power-saving auto-off functionality. Compact and reliable, it’s engineered for the modern tradesperson demanding accuracy and durability on every job.












| ASIN | B07P45RB8S |
| ASIN | B07P45RB8S |
| Batteries | 2 AAA batteries required. (included) |
| Best Sellers Rank | #49,763 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #102 in Voltage Testers |
| Brand Name | KLEIN TOOLS |
| Color | Orange |
| Customer Reviews | 4.5 4.5 out of 5 stars (1,641) |
| Customer reviews | 4.5 4.5 out of 5 stars (1,641) |
| 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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