This one step dual tester is accurate and super easy to use, it is ideal for testing diamonds, non-diamonds and synthetic moissanite. The test takes about a second. Two year factory warranty.
Powered by a nine volt battery. 3 minute shut off alert to save battery. Warm up time is eight seconds.
You could purchase a cheaper diamond tester but you will not be protected from non-diamonds or moissanites. This leads to most people buying a second tester.
Just touch the tip of the tester to the stone, do not try to push the tip inside the plastic case. To many testings on the same stone may cause the stone to heat up and get a false reading.