Information About pH Meters: Important!

I got a question over on Instagram that I thought would make a good dedicated post. It lead me down a super interesting rabbit hole. I learned a lot of pH meters.
As a massive disclaimer. This post is based of research that I did from the Aprea and Hanna websites. Please make sure you do research for YOUR meter. I cannot stress this enough. Directions can be different for every meter even from the same company, so make sure you know for yours.