Pikelet Posted September 26, 2002 Share Posted September 26, 2002 I have a Primo handheld TDS meter to monitor my RO/DI product water. The unit comes with calibration liquid but the device is supposed to be precalibrated out of the box. The fluid should really be used as recalibration fluid. Over time the probe components age(drift in value) yielding small errors in the TDS readings. Has anyone else bothered to recalibrate their TDS probes? How often should this be done? Link to comment
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