Key Features Zoom Ratio6.3:1 Zoom Ratio -- Boasting magnifications from 0.8x to 5x, the twin zooming objective optical system developed exclusively by Nikon provides a zoom ratio of 6.3:1. Clickstops at 1x intervals allow observation at optimal magnification. 60-Degree Eyepiece InclinationThe SMZ660 has a 60-degree eyepiece inclination for comfortable observations. Add to that the 10x eyepieces with the air-tight rubber rings, which don't fall off even when the microscope is inverted or turned on its side and this exceptional stereomicroscope is an excellent choice for OEM application. Long Working Distance Auxiliary ObjectivesSix high quality auxiliary objectives are available for the SMZ660, ranging from 0.29x to 2x to provide a wide range of magnification options and long working distances. An ergonomic auxiliary objective is also available that can be adjusted to the users eye level. ErgonomicsFrom the built-in diopter adjustment on the eyepieces to the gracefully curved stands with low positioned focus knobs, the SMZ660 is built to eliminate stress and allow the user to work in a comfortable, natural position. StandsA wide variety of ergonomic stands are available from plain focusing stands to boom stands to sophisticated diascopic stands assuring that you will always be able to find the right stand for the right job.