Description: This "Diamond Selector II" has a highly compact design and will help you to tell the difference between a genuine diamond and fake diamond. The cost is not even a fraction of the cost of a diamond, and you will gain piece of mind by knowing that you are buying a real diamond, instead of a cheap knockoff. This tester comes with a leather bag and small testing tray for holding loose stones.Feature: Easy to use even for a new beginner Emit audible sounds to give accurate reading Compensation for ambient temperature. Diamond indicator will be showed if the stone is a REAL diamond (Red light) Auto shut-off with a push button switch Metal alert (continuous buzzing sound when user accidentally touches metal rather than stone ) Large / small switch for testing diamonds +/ - 8 points LCD display & LED indicator If stone is Fake crystal, a simulant such as cubic zirconium ( CZ ), will be no reactionSpecification: Size:135*40*20mm Power supply: 9V battery(Not Included ) Specially offer an unique 2 sounds and 3 color lamps display system to identify diamonds from imitations. Weight:100gHow to prepare: Mark on the battery Turn the Power Swith On Confirm the Battery Lamp lights up Wait for about 30 seconds till the Ready Lamp lights up.DIAMONDS: 1. Beeping sound (beep-beep-beep) 2. （1）1~4 of the Red Lamp box OF the Level Meter，（2）will light on. (More no. of Red Lamp boxes will light up for bigger sized stones.)DIAMOND SIMULANTS: 1. No Beeping sound. 2. No Red Lamp boxes will light on. Green and/or up to Yellow Lamp boxes may light on depending on the type of simulants.)METAL ALERT: Continuous buzzing sound. (The thermal conductivity of the metal is very high and can give the same indication as a Diamond with most Thermal Probes. The Diamond Selector II has a Metal Alert buzzer to warn you when the Probe tip touches metal.) If you hear the Metal Alert buzzing sound. re-touch the Probe tip so as to touch only the tested stone.