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⚡ Test with confidence, work with precision — Klein Tools ET40 lights the way!
The Klein Tools ET40 Digital AC/DC Voltage Tester is a compact, professional-grade device designed for accurate testing of AC voltages from 12 to 240 volts and DC voltages from 1.5 to 24 volts. Featuring bright LED indicators for voltage level and polarity, it offers rugged durability with drop resistance up to 3 meters and IP4 dust/water protection. Certified to CATIII 250V safety standards and equipped with an auto-off function, this tester is ideal for electricians and DIY pros seeking reliable, efficient voltage diagnostics in residential and light commercial settings.












| ASIN | B07P45RB8S |
| Best Sellers Rank | #127,443 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #299 in Voltage Testers |
| Brand | KLEIN TOOLS |
| Brand Name | KLEIN TOOLS |
| Color | Orange |
| Colour | Orange |
| Customer Reviews | 4.5 out of 5 stars 1,626 Reviews |
| Global Trade Identification Number | 00092644691836 |
| Included Components | No|Tester, User Manual, and 2 x AAA Batteries |
| 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 dimensions L x W x H | 13.3 x 3.9 x 2.8 centimeters |
| Item weight | 2.3 Ounces |
| Manufacturer | KLEIN TOOLS |
| Maximum Operating Voltage | 240 Volts |
| Measurement Type | Voltmeter |
| Minimum Operating Voltage | 1.5 Volts |
| Model | ET40 |
| Part Number | ET40 |
| Power Source | Battery Powered |
| Power source | Battery Powered |
| Specification Met | CE |
| Style | 12/240 V |
| Style Name | 12/240 V |
| UPC | 092644691836 |
J**S
It is absolutely necessary and perfect.
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.
R**0
Good Klein quality
Good voltage safety tool.
R**J
beau produit
lecteur facile d'utilisation et très bien fait
J**Z
Buenísimo.
¿Quieres saber si hay voltaje el tu circuito? Este es el probador indicado. Tienes las tres "B", bueno, bonito y barato.
R**N
Small and handy
Small and compact, can easily have in a pocket or small pouch. And the addition of no batteries required means less maintenance, the low price also makes it very affordable to replace should it became damaged or faulty. However I doubt the latter as klein is know for quality tools.
Trustpilot
1 month ago
1 week ago