1.Sharp stereo erect image over a wide field of view. 2.45 inclined and 360 rotational binocular head with locked-in eyepiece.The left ocular-tube with diopter adjustment +-5dp,The interpupillary distance is between 55-75mm 3.Zoom objective 1x-4x 4.Each set packed in styorfoam and in an inner box.2 sets in one carton 5.A wide range of optional accessories. 6.With square lamp,adjustable diaphram dark field and gem tweezer Optional accessories: 1.Eyepiece WH5x(22mm),WF10x(23mm)WF15x(13mm),WF20x(10mm) 2.Auxiliary objective 0.5x,0.75x,1.5x,2x 3.Figure eyepiece:VD-TV,VD-PC 4.Fluorescent bulb 5W 5.Halogen bulb 12V/10W/LED 6.Ring fluorescent lighting 8W & 10W