








⚡ Illuminate your workflow with precision and safety!
The Klein Tools ET40 Digital AC/DC Voltage Tester offers versatile voltage testing from 1.5V DC up to 240V AC with bright LED indicators for clear polarity and voltage readings. Built for professionals, it features built-in test lead holders, rugged IP41 protection, and meets CATIII 250V safety standards, ensuring reliable, accurate, and safe electrical troubleshooting on any jobsite.












| ASIN | B07P45RB8S |
| Batteries | 2 AAA batteries required. (included) |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Alkaline |
| Best Sellers Rank | #23,861 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #27 in Voltage Testers |
| Brand | KLEIN TOOLS |
| Color | Orange |
| Customer Reviews | 4.5 4.5 out of 5 stars (1,633) |
| Date First Available | February 19, 2019 |
| Description Pile | 2 x AAA |
| Display Style | Analog LED |
| Finish | Brushed |
| Global Trade Identification Number | 00092644691836 |
| Included Components | No|Tester, User Manual, and 2 x AAA Batteries |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 2.3 ounces |
| Item dimensions L x W x H | 5.24 x 1.52 x 1.11 inches |
| Item model number | ET40 |
| Manufacturer | Klein Tools |
| Material | Plastic Housing, PCB with Electronic Components |
| Measurement Accuracy | +/-0.5% |
| Min. Operating Voltage | 1.5 Volts |
| Part Number | ET40 |
| Pattern | Solid |
| Power Source | Battery Powered |
| Product Dimensions | 5.24 x 1.52 x 1.11 inches |
| Shape | Rectangular |
| Size | One Size |
| Special Features | DC Polarity Indicators for DC Positive, DC Negative, and Both Illuminated for AC. Tests Low DC Voltage to 1.5V. Built in Test Lead Holders on Sides of Tester. |
| Specification Met | CE |
| Style | 12/240 V |
| UPC | 092644691836 |
R**G
BEST for beginners!!
This has been such an easy, accurate to and best for beginners!!
M**E
klien meters
works as it should,great price also, order other klien meters ty
R**N
Save yourself the Shock!
How many times ahve you been working on a DIY project and wondered is the power on or off? Oh well, let me get to work! and Whammy you got the shock! We've all been there and this will save you, literally and never hurts to be safe! These is SUPER easy to use and while basic, it's a small form factor that is straightforard and simple to operate and a time and shock saver!
J**.
Short contacts mean it is a pain to use.
First of all, know that this is a value-engineered product designed to be priced below $20. For some reason, the exposed contacts are extremely small so that you can't plug the contacts into and electric socket. Further, the interface has a constellation of small red lights that light-up each time you touch the contacts. When you turn on the device and touch the contacts to a 120V source, 6 separate LED indicators are lit up. You then have to squint at each (non-illuminated) label to see what is going on. This interface is tedious. --fine if you use it once in a blue moon.
T**M
Electrical Work DIY Must ⚡️
I’m not an electrician. I am a retired tradesmen of the sheet-metal industry, but I do know some electrical work and I pretty much do my own around the house. This is a valuable tool to own to avoid getting shocks and knowing if you have life current or not.
W**.
cheap and works great
Its cheap and works. Others complain that the probes aren't long enough. There are plastic covers on them, take them off and then probes are long enough.
S**T
Remove the caps if you want longer probes
Good for the RV since it pretty much covers every voltage you will run into from 1.5v batteries to 24v DC and up to 240v AC. Wife can use it and you don't need to select a voltage range , just turn it on. I bought this to keep under the truck seat because I enter into many RV lots at night and sometimes I have to test the power poles before I park on first come first serve parks and multi meters are a pain at night or in the rain. The caps come off the ends exposing about 1 inch long metal probes. I didn't bother to put them back on as the probes still snap into place on back of unit with no problems.
A**R
Dissapointing, and not at all like Klein products I've used before
I'm used to Klein products being the standard to measure all others against, so I was disappointed when I received this voltage tester. I have not been able to test it because the attached probes are too fat to insert into an electrical outlet. That is my gripe about this tester, you can't use it to probe an electrical outlet which significantly limits its usefulness.
J**S
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.
S**D
exactly what i need , fast easy and no batteries needed so i can leave it in the car in the winter
G**.
Muy bien! Solo que los cables están muy cortos para medir y en las características menciona que no hay modo de reparación por alguna eventualidad. Es decir que son desechables. Pero aún así son de buena calidad!
J**N
Why did you choose this product over others?: Fantastic product, use everyday, like how it’s pocket sized, just wish it did a continuity audible beep Functionality: Great for proving dead on a circuit when you haven’t got your tool bag to hand Value for money: Very good product for the price
J**N
Regrettably, it falls short of expectations; using it is a frustrating experience, as though one requires an extra pair of hands. Though its appearance is appealing and it once echoed with promise, the harsh truth renders it disheartening.
Trustpilot
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