3 Axis Automatic CNC Optical Measuring Systems Dongguan Yihui Optoelectronics Technology Co., Ltd. Base Info Model NO.:VMS-3020Measurement Object:Outside DiameterRange:0~500mm Description Pre:Programmable Refrigerant Charging Scale (RCS-9010/RCS-9020) Next:CSWUT310 Low-Cost Ultrasonic Thickness Gauge