... microscope,and camera can take photograph on site. 1. Portable grinder: Portable grinder consists of modulating speed motor, flexible shaft, polishing handle ... AC, 50Hz.120W. Stepless speed control: 0-12000rpm 2. Portable electrolytic polisher: Digital display, voltage & current stabilizer, short ... 50Hz Output: DC,0-30V, 0-2A 3. Portable metalloscope: The wide flat field-of-view Achromatic objectives ...