Anyone have a % error if the baking soda is not baked prior to making the standard?
Tom, thanks for posting this. I spent 20minutes trying to find this post before I realized its now a sticky.
And thanks dapellegrini for posting the step by step picture guide, it should help quite a lot of people unfamiliar with making buffers. I'll be testing mine out tonight as my RedSea drop checker came in the mail yesterday from Big Al's. Not near as attractive as the Hong Kong or ADA checkers, but it was only $8. And even at that price I feel ripped off....