Practical Diamond Selector Diamond Tester Gemstone Selector II Gems LED Indicator Jewel Jewelry Tool Test Jewelry Tools and high quality specification: Item type: Diamond Tester Material: Metal, Plastic Color: Black (shown as the pictures) Size: (As picture shows) 13.5 x 4 x 2cm/5.31*1.57*0.79inch Powered by DC 9V battery x 1 ( Not included ) Features: Easy to use even for a new beginner Emit audible sounds to give accurate reading Diamond indicator will be showed if the stone is a REAL diamond (Green light) Metal alert (continuous buzzing sound when user accidentally touches metal rather than stone ) Large / Small switch for testing diamonds +/ - 8 points To emit sounds to give accurate reading LCD display & LED indicator If a stone is Fake crystal, a simulant such as cubic zirconium ( CZ ), will be no reaction Operating methods: 1. Open the power, the power indicator light, instrument began preheating, after a few seconds instrument can be used. 2. Take the naked drill to be tested into support tray appropriate sunken hole, and its mesa upwards. Those already inlay need not put tray hole in, you can use hand to hold it. 3. According to the weight of the tested diamonds and measuring the temperature place to move several bright leds. 4. Take down needle sheath, handhold instruments, the right index finger touch the conductive plate on the back cover of instrument. To make the probe vertically and gently contact with mesa of measured diamond. 5. Carefully watching the instrument, if the rest of the emitting diode light reflect yellow, when light place moves to nine diodes with accompany beeping, this explains those tested are for real diamonds. On the contrary, if light place moves to insufficient nine diodes, and without accompany beeping, this explains fake diamond or counterfeit. Quantity:1PC (No retail package) (other accessories demo in the picture is not included) Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!! Compare the detail sizes with yours, please allow 1-4CM differs due to manual measurement, thanks! Package includes: 1PC X Diamond Tester 1PC X User manual