Calibrated several times with a different PH bar and test strip, but can't seem to adjust to the lower limit when measuring error in using calibration powders and meter setting. After several attempts, I had to settle for about +/-=0.5, which is a larger shift than I expected. Conveniently, I'll concede that while temperature checking is a combined meter, when you get separate devices for checking pH and temperature, everything else costs too much.
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