Biopharm Calibration Electrode Traceable Reference Review

I ordered these pH calibration solutions for my pH meter. The company that makes the pH meter I bought sells their own pH calibration solutions, but at a much higher price and in much smaller quantities. They are great for calibrating the meter and there are many solutions so I can use them for months.

I bought this product because I thought it would be good for calibrating my Apera pH20 meter. The meter only comes with 7 and 4 calibration solutions, so I wanted 10 solutions as well. After calibrating my meter with this stuff, my meter says my tap water is 6.7 ph. I know it's wrong, it should be 7.2-7.3. Then I bought a calibration solution from Apera Tools. After calibrating with Apera, my meter is now working properly.

Buffer solutions do not have the correct pH to calibrate pH meters. Buffers 4 and 7 work moderately, but not very accurately. They differ by about 0.14. A pH 10 buffer is far from ideal. About 0.30. It's so far away that my pH meters don't pick it up. After spending a little more and buying genuine branded buffers, both of my pH meters are properly calibrated. I won't buy this again.