Try Microscope Lab free in your browser, with nothing to install and no account. A real compound microscope on screen: focus with the coarse and fine knobs, turn the turret from 4x to 100x, set the iris and the lamp, and push the slide to find things. Seven slides drawn at true size with real depth, and a pond drop where something is always moving. Draw what you see, label it, and keep it in your slide box.