Soak it in pH 7.0 calibration fluid for 2 or 3 hours turned off first. Then go through the steps to calibrate using a new packet of pH 7.0 and pH 10.0. If it calibrates, then you're golden. Check calibration after by dipping back into the packets and see if they read accordingly. Make sure to rinse in RO between packets.
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~ Mindy
SPS fanatic.
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