Digital Electronic Electric Diamond Detector Test Tester Description: Highly compact device measuring 6,3" x 1,6" will distinguish diamond from simulated fake diamond! Each unit is hand calibrated and guarantees accuracy! It costs a fraction of a diamond. Includes tester, leather bag, battery, fast thermal conductivity meter. Specifications: Material: ABS Size chart: Size: 42*162*22mm/1.65X6.34X0.87" Package includes: 1 piece tester 1 piece leather bag 1 piece battery 1 piece fast thermal conductivity meter Step: If it is /diamond, the light will decrease by 2 fields. When measuring, the hand should touch the back of the steel, and with the other hand hold the diamond, which will make a squeak and full light. If it is false, there will be a quick thermal conductivity meter: 1. Turn on the power supply of the thermal conductivity meter and heat the probe. Usually it takes 20 seconds. 2. Touch the hot surface of the sample and determine whether the test sample is a diamond, based on the results of the thermal conductivity meter.