Apera Instruments, LLC-AI1104 16oz. pH Calibration Buffer Solution Kit (pH 4.00, 7.00 & 10.01), plus 3M KCL Storage Solution and CalBox

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

Works as intended for my ph meter. Great design for solution storage and ph meter holder.

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.

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

This is a great set for calibrating your PH meters. It came with 3 buffers, storage solution and a solution storage case (CalBox). I really like the CalBox. It makes it so much easier to calibrate my PH meter. Juggling small bottles is no fun. I also used one of the complements for distilled water. The only complaint I have is the CalBox lids aren’t water tight. If you do happen to turn it over, some will leak out. Its not a fatal flaw, just annoying. I was hoping to be able to drain one of the compartments as needed but its pretty much all or none. Otherwise I am very happy with the set!

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.

I am unhappy with the product. I have previously bought these pH buffers from this brand and have not had any problems. However, this time the product has disappointed me. Before they came well packaged, well protected, in a white box and it seemed like a well prepared product. The one I received recently is the complete opposite. It seems that they sold me products previously returned for having serious defects, with loss of solution and with crystallization of the same, very unfortunate. It also presents differences in the volume of solutions. I will think again to buy them.

Did not recieve the calbox with the solution. Disappointing that order was not fulfilled like it should of been. Hopefully the solution is good

Amazon package was fine .. the apera box was fine that everything came in.. but the calibration 10.1 bottle was open an leaked about 3" down.. the 4.0 bottle was down 2" and the 7.0 bottle was down and inch from top. Only bottle that was sealed was the storage liquid ... not happy, not ordering from flamingo again