










⚡ 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.






| Brand | KLEIN TOOLS |
| Power Source | Battery Powered |
| Style | 12/240 V |
| Color | Orange |
| Item Weight | 2.3 Ounces |
| Item dimensions L x W x H | 5.24 x 1.52 x 1.11 inches |
| Min. Operating Voltage | 1.5 Volts |
| Specification Met | CE |
| UPC | 092644691836 |
| Manufacturer | Klein Tools |
| Global Trade Identification Number | 00092644691836 |
| Part Number | ET40 |
| Item Weight | 2.3 ounces |
| Product Dimensions | 5.24 x 1.52 x 1.11 inches |
| Item model number | ET40 |
| Batteries | 2 AAA batteries required. (included) |
| Is Discontinued By Manufacturer | No |
| Size | One Size |
| Finish | Brushed |
| Material | Plastic Housing, PCB with Electronic Components |
| Pattern | Solid |
| Shape | Rectangular |
| Item Package Quantity | 1 |
| Measurement Accuracy | +/-0.5% |
| Display Style | Analog LED |
| 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. |
| Included Components | No|Tester, User Manual, and 2 x AAA Batteries |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Alkaline |
| Description Pile | 2 x AAA |
J**Z
Good tool
Excelente for easy and fast volt reading… very practical and functional
M**E
klien meters
works as it should,great price also, order other klien meters ty
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.
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.
M**M
Compact and works great , don’t even need batteries
Works great
R**G
BEST for beginners!!
This has been such an easy, accurate to and best for beginners!!
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.
A**R
The wires are too short
and the lights are too dim to be used in a well-lit place
Trustpilot
1 month ago
2 weeks ago
1 month ago
1 month ago