Fangrui Product Details Features: Made Of High Quality Material, Strong, And Good Performance, Long Service . High Accuracy And Quick Response, It Is Speical Designed To Quickly Distinguish Natural Diamonds From Diamonds. Non-destructive Testing, Easy And Accurate Operation. Handheld Type, Easy To Use. Working Power Supply: Dc9v Battery (battery Not Included) Operation Method: 1. Turn On The Power, The Power Indicator Light Light Up, And The Instrument Begin To . The Instrument For Use In A Few Seconds. 2. Place The Loose Diamond To Be Measured Into The Appropriate Concave Hole Of The Support Tray, With Its Table Facing Up. The Inlaid Piece Does Not Need To Be Placed In The Hole Of The Tray, But Can Be Held By Hand. 3. Brighten Several Light-emitting Diodes According To The Weight Of The Real And Fake Diamond Being Measured And The Temperature Of The Measurement Location. 4. Remove The Probe Sheath, Hold The Instrument, And Touch The Conductive Plate On The Back Cover Of The Instrument With The Index Finger Of Your Right Hand;