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If you’ve been having issues with your Bluelab pH meter you can always replace it with this identical spare sensor model.
These sensors can be used with all of Bluelabs continuous pH meter models; their basic pH meter, the Combi meter and the Guardian Bluelab model.
pH sensors by Bluelab do not need much care, as they come with a gel that keeps them working for longer than other sensors.
Bluelab pH Electrode Sensor