The Swift M2251CL Monocular Microscope is a great value for anyone on a budget and its durable design will withstand use in the classroom. The microscope features 4XD, 10XD, 40XRD achromat objectives along with a monocular viewing head. The 18mm, W10XD locked-on eyepiece has a pointer, and the "slip-clutch" focusing system will protect gears from over-focusing.