A joint revolving arm is provided for moving magnifying lens overkill area of the stage. It has heavy round base with a precisely designed body. It is easily replaceable by a special bull''s eye lens (83 mm dia.) to increase the field of vision. Sensitive focusing is done by rack-pinion movement. A piano-concave mirror reflects sufficient day light and artificial light on the object. Detachable hand rests on both sides of stage provided for a study support during dissection, provided with 10x & 20x eye pieces and special bull''s eye lens (83 mm dia.).