How to used presidium Gemstone Indicator

URL Sunlin Jewellery Equipment Group (HK) Co., Ltd Order Online Features Tests an extended range of 31 different gemstones Color input function to further separate gemstones for more accuracy Easy-to-read results on clear digital LED screen Quick results in less than 6 seconds Industry’s thinnest probe tip (0.45mm) for testing gemstones from 0.02ct Patented refined probe tip Metal buzzer alert and low battery indicator Sleek chrome-brushed ergonomic grip USB port for alternative power source and connectivity