"I initially bought the cheap blue voltage tester screwfix sell, as I'm really a DIYer so don't need the best of the best. However upon testing I found the cheap one a bit unreliable with whether or not it would light up!! Which considering that is it's only function is a bit daft.
So I decided I had better spend out and buy the decent one - after all the whole point of this device is to be completely reliable so you don't electrocute yourself. I have to say I've been pleased with the fluke - it has been 100% reliable and that's what you need. Also easy to change the batteries (the cheap blue one I couldn't get the batteries out!).
As pointed out by others it has to be right next to the 'live' wire within the cable so make sure you test against both 'sides' of a cable to ensure it is not live.
A tone (beep) can also be set to activate or not depending on your choice. Although I admit I haven't worked out how to turn it off or on yet (haven't read instructions!). The red light is sufficient in my opinion. It flashes twice per second to let you know it's on, and lights continuously if it detects live.
FYI this cannot function as a live wire detector for cables buried in walls."
"I bought this to identify a supply cable in a tight bunch of cables all with sheathing (lighting circuits, domestic job). It works fine through sheathing and it would flash/bip only when you on the side of the cable with the brown (line) wire. Since than I used it many times in similar situations, never failed me. One of the tools that I have often with me. Bit expensive but overall happy with the purchase"
"got this product on offer, so can't grumble at the price. 1st day I bought it used it six different times. You can easily keep it in your pocket all day so for a heating engineer like me there's no need to keep going to the van for the multi meter. This item is a time saver and would highly recommend."
"This probably saved my colleagues life today. I always have it in my pocket, and so when working on a 400v supply and nobody was sure if the feed to the isolator we were due to be working off was live or not, I produced this from my pocket and determined it was still live. "I think it's off" could have been a costly assumption, certainly more than the £22 price of having this to hand."
"Had a number of pen testers by other makes before, they never last very long and don't always give reliable results. The Fluke tester is a bit expensive, but does the job really well. Pay the extra and get a great tool."
"This volt stick is the most expensive one you can buy at screwfix but you get what you pay for with this sort of stuff, its reliable robust and easy to use, would recommend you spend a little bit extra and go for the top quality"