This DiamondNite Tester is for testing non-diamond, synthetic Moissanite or genuine diamond with one touch. The initial warm-up time is only eight seconds and the recovery time between tests is only 1 second! This tool is completely portable and uses one 9-volt battery (included), or can be used with the AC adapter power cord (included). Three minute shut-off alert saves battery power. Housed in a gray shock resistant shell with easy-to-read features.