@theosysbio our lab had a lot of fun using this with middle schoolers. Each scope costs about $10, hard to break, and easy to use (you use your phone camera to visualize). It was esp fun with iPads because students could easily crowd around and see the same thing and all participate!
@theosysbio whoops forgot the link! https://goldsteinlab.weebly.com/diymicroscopeworkshops.html