The National Optical 167-series compound microscopes incorporate a wide range of features designed for university and laboratory use. Superb optical clarity and reliable mechanical engineering assure years of top performance. The quad objective turret is ball-bearing mounted for smooth, precise positioning of objectives and features textured rubber knurling for easy grip. The objective turret is in reverse position to permit easier changing and positioning of specimen slides. 360° swiveling eyepiece offers a comfortable observation position, especially for prolonged periods.