This practical unit separates diamonds from CZ and other simulants with a quick reading. Housed in a high impact plastic case, it is everything one needs to test loose or mounted diamonds in rapid succession. This tester alone will not separate moissanite from diamond. The unit features: • Metal alert (a long beep if metal is touched rather than stone). • Switch for testing diamonds under eight points. • Green indicator light if the stone is not a simulant. • Seven second warm-up time with a 150 second shut-off. • Three-year warranty except for tip damage. • Low battery indicator, 9 Volt battery included.