A standard student microscope with built in transformer (solid state) base with continuously variable light control. A 100mm dia. Projection screen attachment has been provided to achieve projection for group viewing of slide image. Illumination by 12V 20W halogen bulb. Achromatic Objective: 10x, 45x Hug. Eyepiece: 10x, 15x Magnification: 100x to 675x.