TRINOCULAR OBSERVATION HEAD Siedentopf observation head inclined at 45° rotatable at 360°.Diopter adjustment ring on ocular tube.Interpupillary distance from 55mm to 75mm.EYEPIECEWide field Eyepieces 10X (Paired) FOV 22mmOBJECTIVESZoom 0.7X to 4.5X with magnification ratio of 6:1MECHANICAL BODYa) Lateral zoom control movement.b) Reflected and transmitted light system with 12V-10W halogen tungsten lamp.The system regulated with transformer has intensity control knob.On/off switch provides flexibility to use either both light or any of them.c) Clip for holding specimen.d) Base size is 260mm X 290mm.MAGNIFICATION RANGE7X - 45XWORKING DISTANCE98mm