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

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.

Works excellent! Fast and accurate! Saves a lot of time...and the best part, it's thin.

I bought this to help me track down which light was bad in multiple light strings. It did a good job, not great but good. I had a few mis-reads but over all it was worth the purchase.

I have never owned a non-contact tool as sensitive as this thing. It's AMAZING. On the highest sensitivity, you will be able to tell there are nearby live wires. Not exactly where, but that there are some nearby. If anything, it may be too sensitive. At the lowest sensitivity it will even point which side of a double stranded wire is the hot side. That's pretty amazing for such an inexpensive tool. I keep it at #7 to start, then go up or down as needed for the job at hand. On #1 (least sensitive) and near a live peeled wire, it definitely let's me know if there's any danger. Unfortunately it will not help if triangulate if the wires are behind drywall. The results are too erratic, but that's not what this tool is designed for.

Good product, need to be inserted in plug to sense

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.

Excellent tester. I’ve had several before and paid around $20 for them, but this one is the best. Highly recommend.

Works great well made and a great product