I recently picked up a variac to use with my amps. I just play at home and i've got 6 home built amps - i don't want to unplug and replug my amps all the time so i built a couple of outlet boxes, connect them to the variac and plug my amps into them. I'm wondering if there's a plug in voltage meter any of you guys recommend so i can tell at a glance what voltage i'm operating at at the plug - my variac doesn't have one and i've got a couple of extra plugs. The dial on the variac is accurate (confirmed with my multi-meter), but that's based on the wall voltage when i checked (it's also difficult to see). I'm interested in the actual voltage without having to test all the time. The ones i see on amazon are probably fine, but they're also (probably) junk This one is sold under a bunch of brand names, i might just order one and see how it goes but figured i'd check here too.