Customer Service > FAQ's > Which Calibration Solution do I use first when calibrating a Bluelab pH instrument?
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Which Calibration Solution do I use first when calibrating a Bluelab pH instrument?
A. If calibrating with pH7.0 and pH4.0, ALWAYS calibrate to pH7.0 first, then pH4.0. If calibrating with pH7.0 and pH10.0, ALWAYS calibrate to pH7.0 first, then pH10.0.
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