My acid ran out and my gold stockpile is growin, i need help!

     So I've always used the acid test to figure out if gold is real/what carat it is etc. I'd really like to go to an electronic tester and have read some reviews but was hoping people here would chime in on what they use. Also if you have a good diamond tester(i currently have a guy i trust but he's about 150 years old so won't be around forever) and silver tester i'd be interested in what you have to say. Thx.

Running out of acid sucks! 

I've got a guy who tests and buys all my jewelry. He's great cause I learn something new about gold/silver/jewelry just about every time we get together.