DRO kits for milling machine: Item NoDescriptionSize for linear scales:ST-2VDRO 2 axis , with 2 linear scales ,resolution 5um(0.0002") .900*400mm(35.4"x15.8")ST-3VDRO 3 axis , with 3 linear scales ,resolution 5um(0.0002")1000*450*400mm(39.4"x17.7"x15.7")DRO kits for Lathe machine: Item NoDescriptionSize for linear scales:ST-L2VDRO 2 axis , with 2 linear scales ,resolution 5um(0.0002")750*300mm(29.5"x11.8")ST-L2VDRO 2 axis , with 2 linear scales ,resolution 5um(0.0002")1000*300mm(39.4"x11.8")DRO kits for grinding machine: Item NoDescriptionSize for linear scales:ST-G2VDRO 2 axis , with 2 linear scales ,resolution 1um(0.00004")400*200mm(15.7"x7.9")ST-G2VDRO 2 axis , with 2 linear scales ,resolution 1um(0.00004")500*250mm(19.7"x9.8")