Review on Biopharm Calibration Electrode Traceable Reference by William Bell
Do Not Buy - Laboratory Chemicals
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.
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