Protractor Eyepieces 1-Minute Reading Eyepiece For all measuring microscopes exept those with universal illumination The viewfield includes crosshairs and 60¡Æc lines, and angle indexes are read by appropriate microscopes. The measuring range is 360".° 10-Minute Reading Eyepiece For all measuring microscopes exept those with universal illumination The viewfield includes crosshairs and angle indexes. When the knurled ring at the lower section of the eyepiece tube is turned, the crosshairs and the vernier both rotate up to 180" Note: Monocular adapter (standard equipment) is required when using these eyepieces with trinocular tubes. Objectives 1X .3X .5X .10X .20X .50X .100X     These compact objectives feature long working distances, excellent resolution, and all of them have almost the same parfocal distances. Can be used with MM-40/60/100B microscopes. The 3X objective comes standard with the microscope. Magnification 1X 3X 5X 10X 20X 50X 100X Woking distance(mm) 79 75 64 49 20 15 4