This National Optical-brand, model 131-RLED cordless/rechargeable microscope is designed to meet or exceed high school teaching requirements, is ruggedly built, and includes all the teaching essentials. This microscope can be used with Biology , Marine Biology , and Advanced Biology. Note: Lab equipment, which includes this item, is not eligible for return or refund. Apologia product: https://www.apologia.com/shop/microscope/