16oz. pH Calibration Buffer Solution Kit (pH 4.00, 7.00 & 10.01), plus 3M KCL Storage Solution and CalBox

Up until now I used the packs in which you would mix with RO water to check my PH meters for my planted aquariums. I use a stand alone unit as well as a PH Controller. I absolutely love the fact I can put these solutions in the container and keep them for an extended amount of time. I have went from checking my pens monthly (if that) to at least once per week! I have found my PH Controller really needed to be checked more often. I can do it in seconds now versus 30minutes. Great Buy!

I purchased this without knowing what was in the kit when I was buying my probe. This is a kit of 4 bottle of calibration solutions and a little stand for the solutions. Not something someone at home needs. I returned and will be buying just the 2 solutions that came with my probe when needed. Which should be in a year or 2.

After buying some off brand calibration solution my ph20 meter said my tap water was at 6.7 ph. I know my tap water is 7.2 - 7.3. I bought this kit with the 3 solutions the 3m kcl, and the cal box. Now my meter is reading correctly.

It's accurate, a good value for the money, and there's enough of it to last a while. I'm impressed.

This is the second time the kit is missing the 3M KLC Storage solution,called amazon the will send my one bottle tomorrow.Otherwise I am very happy with apera inst. ph buffers. Thank you