One of the most advanced, easy to use testers in the world. The Mizar M-24 tester precisely determines gold karat values equal to or greater than 9k, 10k, 12k, 14k, 16k, 18k, 20k, 22k, and 24k. Simply place a drop of solution on the test object and touch the wet portion with the tip of the electronic tester. Distinguishes gold flash and gold plate from solid gold. Tests all color of gold alloys. Non-destructive testing. Determines platinum. Shuts off automatically after each test to increase battery life. Tests in as little as two seconds. Detailed operating instructions included.