This is the complete lab set recommended for Exploring Creation with Biology. Microscope #131 is included, and built to exceed school teaching requirements. Optical system has DIN widefield parafocal, achromatic, color-coded 4x, 10x, and 40x magnification settings. The illuminator base has a 115V 20watt bulb, heavy cord and switch; it has both fine and coarse focus knobs. Stage is 110mm x 120mm, acid & reagent resistant, with a built in condensor lens and 5 hold disc diaphragm; stage clips are locked on and spring mounted. Overall, microscope is 13 3/4" high; base is 5" x 7 1/2". Weighs 7 lbs and comes with a Lifetime Limited Warranty from National Optical. This high quality scope is deservedly popular and is bound to give you years of service.