Sperry Instruments VD6505 Adjustable Non-Contact Voltage Sensor, 12-1000 V AC

A rugged well made tool that works very well. Same hi vis yellow plastic and black rubber grips as Dewalt Tools. I really like the adjustability of it. At full sensitivity, I get it within a few feet of a circuit or fluorescent light and it starts buzzing. All the way down and it does not detect anything, so the range of adjustment is fantastic. I can dial it in so precisely that I can hold it on one side of an insulated wire and it will not go off, but when I move it to the other side of the wire (where the hot conductor is) it goes off. That's accuracy to a few millimeters. Best way to use it is to calibrate it ahead of time. Stick it in the hot side of an outlet, on a wire or conduit, hover it over a wall switch or outlet that you know is hot and adjust the knob until it buzzes, now it's ready to test the unknown circuit. I live in a 60+ year old house with plaster and chicken wire lathe wall construction. At a little more than 1/2 sensitivity it detects the wires inside the wall, inside of metal conduit. By moving it back and forth and seeing where the buzzing starts and stops, I can trace exactly where that wire is in the wall between the studs. Makes it easy to trace or detect wiring in the walls before I cut or drill through. If you will only use one of these to stick into outlets or against wires to see if they are hot then the adjustability feature may be overkill, but to get a lot of varied use, I'l glad I chose this one.

I was looking for a simple, no nonsense 110VAC wall outlet voltage sensor at an economical price. This is it. Place the tip of this device about 3 inches from your wall outlet, keep the ON button depressed and adjust the sensitivity dial until there is no beeping sound. Finger off the ON button, move the device so it just touches the wall outlet and hold down the ON button. Increase the sensitivity dial until it starts beeping and the light goes on.. That's it. No need to do anything else after that for all future checks on your wall outlets. In my case, with the sensitivity set this way, I can move the tip of this device along my (5/8" sheetrock) interior wall AND IT DETECTS THE WIRES WITH VOLTAGE BEHIND THE WALL! A real bonus for a unit at this price point. Nice and compact, appears to be well made. Ordered 2 more to be sent to my adult children for their home toolbox. A good household safety tool as well as a good troubleshooting tool. You won't be disappointed.

Tracing wires in walls is difficult. Check out all the devices sold on Amazon for that purpose. Some are very expensive and the reviews indicate that the process is difficult still in 2012. This Gardner Bender (actually it seems to be a Sperry) not only checks for voltage by actually touching a wire, but can sense it in a wall and help you locate hidden wires. Also, you can put it near switches, outlets and devices and immediately know if power is on there. An aluminum laptop really lights the thing up, as do lamps, bulbs and appliances. What makes this device work is that it has a tiny little rotating dial allowing the sensitivity to be turned up or down. Quite a wide range actually, from almost off to sensing from a distance. If there is a live wire in a wall and you turn up the dial, the device will surely detect it and will in fact make it seem that there are wires everywhere in the wall. You have to turn the sensitivity down or move the device back from the wall to narrow it down. I found that you have to wave it back and forth, constantly changing the sensitivity and distance as you go along. You have to retrace your findings, see if you can get consistent results. Eventually you will get it down pretty good It is a slow process with a lot of manipulation and still you can only get to within maybe six inches or so of some wires, but that is usually close enough. If I did this for a living where time was money I would investigate a more expensive device. What I do not like is that the dial is very small and has no markings or tactile feeling so you really don't know where you are on the sensitivity scale. It is also easy to move it inadvertently. This really is annoying. A thumbwheel or simply a bigger dial with markings or clicks would be good, best being a digital readout. This sensor is cheap and it works. Kind of a 3.5 stars really, but very useful still. Hecho en China.

I've used it for several jobs and haven't even started my major wiring projects. Wanted to install a strong, reliable grab bar in my tub/shower exactly where I wanted it. Didn't want to be limited by the location of the wall studs. Before cutting out the sheetrock in the next room so I could add bracing between the studs I had to 1) locate the wiring precisely so I didn't cut it and 2) make sure it was dead while I was cutting. The sensitivity dial helped me pinpoint the location and route of the wiring. To start, I set it sensitive enough so that I could detect live wiring behind the sheetrock from about a foot away. I continued to dial the sensitivity back so that I had to be within an inch or two of the wiring for the sensor to respond (with a red blinking light and loud chirping sound). Then by moving the sensor along the wall, I could very precisely trace the run of the wiring, marking it with blue painter's tape. Before cutting into the sheetrock I flipped off what I was fairly sure was the correct breaker. To make sure, I dialed up the sensitivity of the sensor and swept it all over the wall where my painter's tape was. No response from the sensor indicated that I did flip the correct breaker, so it was safe to cut into the sheetrock. (In this situation you can hold the sensor near a lamp to make certain it will respond to current.) Silliest use I've made of the sensor was to make sure my crockpot was on. I'm going to upgrade my kitchen circuits. In the meantime the few kitchen receptacles are on one circuit, the electric range is on it's own. The range has a standard "convenience" outlet for temporarily plugging in an appliance, but it's old and "iffy". I started the crockpot on the regular kitchen circuit but had to move it and plug it into the range's convenience outlet. The crockpot doesn't have a power light, so I wasn't sure it was getting electricity. Maybe the plug needed a jiggle? Got my Sperry adjustable volt sensor out and sure enough, there was power in the crockpot power cord. Dinner was saved. The adjustability is what makes this so versatile. I've fiddled with the sensitivity dial and gotten it so that I could tell the hot from the neutral side of the power cord on a table fan. Touch the sensor to one side of the cord, no response. Touch it to the other side, flashing and chirping. Take a close look at the cord, and the no-response side has the telltale "neutral" ridge. It's a well-made and useful tool. Could save your life, could save your wiring. Could save your dinner.

Whereas I agree if you are an untrained electrician that this tool could actually be misleading/confusing when "sniffing" voltage, but for a professional that is trying to differentiate which wire is the hot and which one is the neutral on ancient wiring- it is a godsend. I regularly come across knob and tube wiring, and I have successfully used this tool for almost 10 years. As a service electrician, I end up pulling it out of my bag about once a week. It is a very reliable tool and has it's place. In contrast, using a regular voltage sensor that doesn't have adjustable sensitivity, the magnetic field of the hot wire can induce a false reading on the unenergized wire. But for this tool to be used properly, you realistically just have to ensure it is calibrated each time you use it. Just stick it in an active receptacle. You can quickly find the "sweet spot" by adjusting the thumbwheel so that it beeps when you insert it in the right slot of a LIVE receptacle and it doesn't beep when you insert it in the left (neutral) slot of the receptacle. Then it is ready to differentiate which conductors are live and which ones are not.

I had a non-adjustable voltage sensor and found it too sensitive when using on 240vac. This one is really nice because you can set the sensitivity higher for coarse work, and down to get more accurate results, or when using on 240V. I modified mine so I can use it with one hand and adjust the sensitivity with my thumb while using it, to suit exactly what I need for what I am doing. Normally you have to press and hold the on/off button to use it, which makes it almost impossible to adjust sensitivity while actually using it. I would test the sensitivity, release the button, adjust the sensitivity, press the button to test it again, repeat, repeat until the sensitivity was where I wanted it... pain in the patooty! So, I added a Rube-Goldberg addition that lets me turn it on and leave it on while I use it and adjust it without having to hold the button down with my thumb. It's not beautiful, and it's crude, but it works! Made it with a piece of paper-clip and drilled a hole in each side of the case (carefully!) for the bent ends of the paper clip to fit into. I also carefully used an X-acto knife to cut a small notch in the yellow case on each side of the on/off button. When I slide the paper clip forward it snaps down into the notch and the spring-tension of the paper clip holds the button down in the ON position. Then I can use it and adjust the sensitivity with my thumb at the same time. I also put a dot of white paint on the adjusting wheel so I can quickly tell where it's set. If you look VERY closely at the wheel, you will see a tiny arrow on one of the 'fins'... I put the dot just to the left of that arrow. I've added 2 photos, from the side and a front-view. Probably no one will care about any of this, but included it just-in-case anyone does.....

Generally I love Sperry products. They are well engineered and work well. And I bought this because it was made by Sperry! I wanted a voltage detector that had an adjustable sensitivity. But the sensitivity on this is bad. It was either too sensitive and beeped at wires with no power or when you turn the sensitivity down slightly, it didn't beep at all for wires that had voltage running. Ultimately I had no confidence in what this voltage detector was saying. I could not trust that a wire had or didn't have power. What good is it??? Sperry you are a great company. Fix this product! But if you are buying this to confidently know that a wire has power, don't.

I've used this for finding wiring in a room that's being re-done after some water damage. The sensitivity dial is SO sensitive and "iffy" that it's hard to know sometimes whether or not there's wiring behind the wall and, if so, where it is. For example, the meter might be "going crazy" on a section of the wall so I feel sure there's wiring there but I want to know exactly where. So I adjust the wheel JUST A HAIR, and then the meter doesn't read anything at all. So I have to settle for knowing that somewhere in the wall there's wiring and I have to find it some other way. The lack of a manual does NOT help, and if you go through the trouble of looking it up online, you still find nothing worth the time it took to look for it. Another thing that definitely does NOT help: Indicating current in a dead outlet. I turned off the breaker to an outlet I wanted to change out. The lamp that was working in the outlet before I turned the breaker off no longer worked. (So far so good.) I checked the outlet with a volt-ohm meter. No voltage. (So far so good.) When I held this sensor in the general vicinity of the outlet it was silent BUT when I placed it right next to the outlet it just beeped like crazy and it didn't stop until I moved it away. Not so good!

I use this at work as an electrician and have found the sensitivity adjustment very useful - it will react at quite a distance with new batteries, which are lasting well, and can be set to pick up lower voltages/closer to cable to identify live conductors I generally don't trust cheap electrical testers but this one has so far proved to be very good. It has limitations in regard to clarity of the voltage it picks up, it won't tell you what the voltage is - just that there is voltage present. Otherwise - I was so impressed I bought another for a work mate ....

This is a must have tool for any DIY guy doing electrical work around the home. Works great and save time tracing live wires. You can regulate it to check from 14 volts DC to 600 Volts AC. The seller was fast in shipping the product and was received the same way as advertise by the seller. I have no hesitation in recommending this seller to anyone who may be thinking of purchasing this item.

Nice product.

This thing works really great. If you have any question if the circuit is on or off this will tell. Anywhere a electrical current is moving, this will alert the person. Worked wonderful when I rebuilt my garage.

Very good price for a non contact voltage tester with adjustable control for sensitivity.