Non-Contact Voltage Tester with 9 gear Adjustable Sensitivity Voltage Detector Pen AC Circuit Tester Tool LCD Display LED Flashlight Buzzer Alarm Range12V-1000V & Live/Null Wire Judgment AC1

The device is oversensitive even at lower sensitivity settings. For Both Null and Live it keeps on beeping and of low accuracy. Low quality product. Compared to another brand which I used earlier it is just a waste of money at the price range

Es muy funcional el producto y muy práctico, ya que tiene varios niveles de ajuste de sensibilidad, lo que facilita demasiado las lecturas de voltaje.

Anyone who has done electrical work knows it sucks to get shocked. Anyone who does electrical work probably also has guessed wrong about the wiring or circuitry at least once. I was on the fence about needing this tool, since I have a multimeter and routinely use it to check things before and during my work. But recently I was using this NCVT, and realized sometimes I'm wrong about which wire is live on a light switch, and a multimeter isn't as effective at telling you that. It's easy to identify live wires and cables, to tell if multiple circuits are involved in a junction box (maybe you didn't turn off the right breaker yet!) and it works for low voltage too, which is where I spend a lot of time, just adjust for low sensitivity or high sensitivity as needed. Overall, it's made a believer of me.

It does the job

Good products..seems to be pretty sensitive so no need to go over 3 setting on the pen. Tested on many sockets and he was accurate.Well design with a nice led light.Loud beep with bright clear indicator light when working in sunlight.

This isn't the perfect product, but don't let this stop you from choosing this specific non-contact voltage detector. Like all such products (and there are MANY) it suffers from the same problems: at times too sensitive and at other times not sensitive enough. The reason is simple enough: these voltage detectors are based on the assumption that the person holding the detector in his hands is at ground potential (or close to it) and that doesn't always happen to be the case. Where this specific product stands out is that the sensitivity can be adjusted in 9 steps. This allows you to reduce the sensitivity in situations where there is so much energy in the area that the detector alerts even near non-conducting materials or at no object at all in mid-air. The multiple detection levels help to distinguish between weaker (possibly false positive) signals and stronger detection (likely to be an actual live circuit). I personally don't trust these voltage detectors to keep me safe when working on electrical circuit. The reason I bought this detector was for troubleshooting light strings and with its adjustable sensitivity and 3 level strength indication it does work reasonably well for that purpose (much, much better then voltage detectors that are not adjustable and only have a single alert level). I would not recommend it as a safety tool for a job site as it does appear fragile (lightweight plastic). Thrown into a bag of heavy tools it would probably not last very long. The reason I'm giving it 5 stars is for the sensitivity adjustment and multi-level alerting. I tested those features and they work very well for my intended purpose.