The Biological Microscope 105 has the newest pattern ,steady construction, and convenient operation with backward nosepiece, equipped with achromatic objective and wide field eyepieces. Monocular or binocular for choosing. There are the model 105A and the model 105B about gear wheel focus system (the model 105B has the adjustable tension and limit stopper system). The instrument can be used for medical test, teaching and micro-observation in hospitals and schools etc.