Good Tool Simple calibration for stones of various sizes Easy to use even for a beginner Helps verify authenticity before Function compact design Helps you tell the difference between a diamond and a fake diamond LCD Display & LED Indicator LCD display and LED indicator with audio result indication Nondestructive testing that does not harm your belongings Battery low alarm automatically alerts you Audible signal complements the readings for easy interpretation Easy to Carry Lightweight and compact in size for portability Ergonomic handle for a comfortable grip Convenient to carry and store Suitable for jewelry display or identification assistance Use scenarios In a jewelry store or showroom to quickly verify stones before display or At home or during shopping to confirm authenticity of stones in a or collection In a workshop or during appraisal to perform fast, nondestructive checks on stones