The SM100 Series offers six models from which to choose. The SM101 features fixed magnifications of 10X and 30X. The SM102 features fixed magnifications of 20X and 40X. The SM105 features a variable zoom magnification range of 10X-30X, offering added versatility. Each model is available in corded and cordless versions. All models include energy-efficient variable LED illumination with 5 light settings, one-touch spring loaded stage clips, and right eyepiece diopter focusing adjustment. Ideal for high school classrooms and up.