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It work's, but the operator needs to know how to operate properly, it's the acid test with the difference that it's the machine that tells the karat and not the operator. I think it's good for beginner's or a store with many different employees that buys gold.
 
I'm not sure it is like an acid test. The product description states, "No messy gel. No staining chemicals. No dangerous acid."

And another unit that is self contained instead of plugging into a smart phone states, "All you need to do is put the metal on the square plate and touch the probe to the metal, the LED will instantly light up which indicates the karat. The pen probe that comes with the unit has no harmful chemicals and is actually made of a saltwater solution. It leaves no residue on the metal being tested, so you don’t need to worry about ruining any expensive jewelry. The pen probe will last approximately 5,000 tests with proper care."
https://www.amazon.com/gp/product/B00557CZQU
AuRACLE Model AGT-1 Electronic Gold Tester from GemOro
 
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