As your children advance in their science learning, you will want to have a microscope. A microscope can be borrowed from a family member, passed down through your homeschool group, or shared through a coop.
You can also purchase your own, and Home Science Tools has a great article on how to select a microscope.
Home Science Tools has a great YouTube channel where they showcase their products for teaching science. Here is a video highlighting their Kids Microscope product.