Features: Starts automatically - no button to push. Precisely determines gold karat values, equal to or greater then 9k,10k,12k,14k and 18k. Distinguishes gold flash and gold plate from solid gold, test all color gold alloy. Non-distructive testing. Helps determine platinum, determines gold karat under 2 seconds, two year warranty. Battery operated and comes with a full two year warranty and initial testing solution and accessories pack. USE replacement chemicals 6-2013.