PMB90Portable metallographic polishing instrument,Imported miniature all metal handle,belt90Angle of rotation,speed15000turn/In minutes, the intelligent controller can switch forward and backward with just one click,stepless speed regulation，Both DC and AC can be usedThe continuous working time shall not be less than6Hour;Can be used for grinding and polishing metal materials and thin thin-walled boiler tubes, in conjunction with dedicated grinding heads on site3-5Quickly throw the mirror in minutes.