Features:Handheld mini diamond selector II for testing real diamond or fake.Specially designed for quick, easy and precise testing without damaging the diamond.Portable electronic diamond testor can be used to test diamond, crystal, jade, gem etc.It will emit audible sounds for you to distinguish real diamond.LCD display & LED indicator to provide accurate reading.Specifications:Power Supply: DC 9V Battery * 1(not included)Material: Alloy, PlasticColor: BlackItem Weight: 66g/2.3ozPackage Weight: 130g/4.6ozItem Size: 16*4*2.3cm/6.3*1.6*0.9inNote:1.The thermal conductivity meter is an electronic instrument specially designed and manufactured according to the thermal conductivity of diamonds for identifying the authenticity of diamonds;2.The tester is a precision electronic instrument, the operating environment should be 5-35 degree Celsius, and the relative humidity of the air should be below 80%;3.The diamond to be tested must be clean, dry and at room temperature.Package List:1*Diamond Tester1*Leather Pouch Case1*Testing Platform1*User Manual