I still prefer the "wiggie" style on my pouch. (Knopp is my favorite). There is no on/off switch to toggle. It shakes in my hand when live voltage is contacted. I do not normally work on circuits above 600 volts. There is less room for human error, such as forgetting to turn on the switch when reading for voltages. But I have a fluke t-5 close by for more accurate readings.