ALDON Innovating Science pH Buffer Calibration Kit - 500mL Each pH 4, 7, 10 & 4oz KCl - The Curated Chemical Collection

Received as expected.

This stuff seems to work just fine. I didn't do an analytical, double-blind study on it's accuracy as some others here apparently have. But I would say this. This set costs as little as half as much as the same products from name brand manufacturers. And even they have detractors claiming they aren't spot on either. I think there are always naysayers. And it clearly states the product is for students in the classroom, not for atomic scientists. So for those of us who have to budget these things as one more expense of our hydro setup when we ran out of money four expenditures ago, Innovating Science is a godsend. When I have more money, maybe I'll spend it. But for now, this works for me.

Good quality, good price and fast delivery. I use these to calibrate a pH meter. They seem to be spot on and give consistent results. My desired accuracy is not that great +/- 0.25 on measurements but this seems to get my instruments to +/- 0.1. I calibrate about once every twenty five readings doing anthocyanin extraction in HCl aq.

After 5 month of use. Buffer are not accurate at all.Big dissapointment.

Best price I found for calibration solutions. Used in conjunction with the Bluelab PH & EC pens. 100% pleased with my overall testing kit3 part kit provides increased accuracy over the 2-stage. The storage solution is great and appropriate that it comes in a smaller quantity.Be sure to keep stored in a cool dark location, don't pour excess back into the big containers and you're good to go!