... metallographic samples and electric microscope Model:KY-300 Mini Precision Grinding/Polishing MachineBriefIntroduction:KY-300 Mini Precision Grinding/Polishing ... power supply:110/220V,Power:50W7. Tray runout:0.02/100mm,Timing:0-99.99H8. Stepless speed adjustable,fasten ... Weight:11kgStandardPackage:Standard moistureproofand and shockproof package KY-300 Mini Precision Grinding/Polishing Machine