This is my version of the cellscope from Fletcher Lab at UC Berkeley. I really liked the compact design and simplicity of this microscope. It only needs a few parts that you can easily find on eBay or aliExpress. I tested this with a 20x eyepiece and 20x objective, giving me 400x magnification with a really sharp image. When using this with a mobile phone, you have digital magnification also. The picture from the mobile phone is very good. So for this inexpensive microscope, you get a lot for your money. The focus system is tight fit, this is so you don't get focus shift. Some sanding may be required. I used some plastic gear grease on the inside of the focuser. Mobile phone holder is for Samsung S7, universal holder will be uploaded as soon it's done. This is still a work in progress

1. 2 x K9 optical glass 25x25x25mm
2. WF20x microscope eyepiece
3. 20x Achromatic objective lens
4. Asaklitt Mini LED-Light

Total cost 75$