brand new and high quality Features: Made of high quality material, strong, durable and good performance, long service for time. High accuracy and quick response, it is speical designed to quickly distinguish natural diamonds from various diamonds. The principle is based on the different thermal conductivity of diamonds and various imitation diamonds. 2 kinds of sound, 3 kinds of color lights, easy to identify the authenticity of the diamond. Non-destructive testing, easy and accurate operation. Pocket, handheld type, easy to use. Gemstone Selector only, other accessories demo in the picture is not included! Specification: Material: Plastic Size: app.8.5 x 5.4 x 1.3cm/3.35 x 2.13 x 0.51in Color: Blue Quantity: 1 Pc Operation Method: 1. Turn on the power, the power indicator is on, and the instrument starts to warm up, then the instrument is ready for use in a few seconds. 2. Put the tested for naked diamond into the appropriate recessed hole in the support tray, and place the flat side up. The inlaid diamond does not need to put in the tray hole, handheld detecting is available. 3. Brighten a number of light-emitting diodes according to the weight of the tested diamonds and the temperature of the measurement site. 4. Remove the probe sheath, hold the instrument, for touch the conductive plate of the instrument with your right forefinger; and gently for touch the flat side of the diamonds with probe vertically. 5. Carefull watch the reflection of the instrument. If the remaining yellow light-emitting diode is on, when the light is on to DIAMOND, with a beep sounds, it means that it is a true diamond. Otherwise, it is false diamond. Repair and maintenance: 1. The probe of the instrument is very sensitive and must be protected with special care. It should be sheathed when not in use. 2. When the reserve indicator is dark, the battery will be depleted and the battery should be replaced. 3. the instrument does not use for a long for time, please remove the battery. Precautions: Do not attempt to open anything other than the battery cover! So as not to damage the instrument Note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Gemstone Selector