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.

I ordered this meter to step up my game in making dry fermented sausages. Most recipes I have found give you a range of hours for fermenting with a caution to test the pH to optimize the flavor. I have been looking for a good quality portable tester and this is exactly the tool that will ensure accurate and repeatable results. The unit is able to be calibrated and the video tutorials answer a lot of questions.

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

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.