Droopydroors
Well-Known Member
I hope I'm putting this in the right place but I'm sorry if not. I can't seem to find the answer to this question so I figured others might benefit. I got a cheap digital ph meter and it can with 3 packets of powder solution to mix with distilled water for calibration. I was just about to order more because I thought they were "one time" use. Can I mix these solutions and put them into air tight containers and use them for a period of time? If so how long is that time.