Donald Trump
Member
You are just plain WRONG! Do a search and see how many threads there are concerning problems with pH pens.
I can buy a roll of pH paper for about 12 bucks and it lasts for 6 months. In 5 yrs i've never regreted not buying a pen and i've never had a pH problem. I just don't understand why people bother with pens.
read the 2 posts above yours. That is why we deal with pens.
I've used the damn solution color-coded mess. It'll work but it's for people who aren't picky and don't give a damn about fully accurate results. I have a $50 pH pen for over a year now. It needs calibrating every 4 months. It's not hard. Take care of your pens and they will last you a long time.