AO Microstar Binocular Microscope model One-Ten. Quadruple nosepiece with 10x, 20x, 40x, and 100x oil Plan achromat objectives. 1.25 n.a. Abbe type condenser with in-base field diaphragm and swing-in filter. Two 10x WF eyepieces. In-base controls and standard mechanical stage. Illumination ESB 6V, 20 watt halogen bulb