Biology MicroscopeThis microscope is for use with Discovering Design with Biology. This is not required if you are not doing the microscope experiments. If you need a microscope slide set also you might want to consider the Biology Complete Microscope Lab Kit All metal body construction Monocular head with ergonomic 45 incline, 10X Wide field ocular lens and 360 rotation Triple revolving nose piece featuring achromatic 4X, 10X, and 40X objective lenses Dual layer