Visual Voltmeter
I hate using multimeters. It’s not that I can’t figure it out, it’s that it always takes a while to compute things; for example the approximate strength of the electricity (to make sure you don’t blow out the fuse in the instrument), the proper way to connect all the cables, etc. Then, the stinkin’ thing gives you a reading that may or may not be off by a power of ten, and may be inexplicably negative.
Introducing the Visual Voltmeter !
Press it against the object you are testing, while holding it in the palm of your hand. Just slide the dial until you can see the glow of a live wire!
The visual voltmeter’s lens glows to indicate a charge flowing in any direction. The secret of the gadget is a polarizing filter coupled with a thin layer of ferrofluid. The sliding bar adjusts the sensitivity for all uses in the home, shop, or office.