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⚡ Test Smarter, Work Safer — Klein Tools ET40 Lights the Way!
The Klein Tools ET40 Digital AC/DC Voltage Tester is a compact, rugged device designed for precise voltage measurement across a broad range (12-240V AC, 1.5-24V DC). Featuring bright LED indicators, DC polarity detection, and an auto-off function, it ensures reliable, efficient diagnostics for residential and light commercial electrical work. Built to professional standards with CATIII 250V safety rating and drop resistance, it’s powered by 2 AAA batteries and backed by Klein’s 160+ years of trusted craftsmanship.












| Asin | B07P45RB8S |
| Batteries | 2 AAA batteries required. (included) |
| Best Sellers Rank | #114 in Voltage Testers |
| Date First Available | 12 February 2019 |
| Department | Unisex Adult |
| Is Discontinued By Manufacturer | No |
| Item Model Number | ET40 |
| Manufacturer | KLEIN TOOLS |
| Product Dimensions | 13.31 x 3.86 x 2.82 cm; 65.2 g |
User
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.
User
Good Klein quality
Good voltage safety tool.
User
beau produit
lecteur facile d'utilisation et très bien fait
User
Buenísimo.
¿Quieres saber si hay voltaje el tu circuito? Este es el probador indicado. Tienes las tres "B", bueno, bonito y barato.
User
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
3 weeks ago
1 week ago