J-300 inverted metallurgical microscope ,imaging clearly, wide field of vision J ... an important tool for study materials, Applicable to industrial and mining enterprises, institutions of higher learning and ... Wide field WF10X/18mm, WF12.5X15mm4)Objectives:Special use metallurgical objectives, flat-field achromatic objective lens 4X ,10X ... )Power:transformer,220V J-300 Inverted metallurgical microscope