Bluelab Replacement pH Probe for Guardian, Combo, & pH Meter

Easy to clean due to its bullet shaped glass bulb, the Bluelab pH Probe is fully waterproof and less fragile than all-glass electrodes thanks to a tough polypropylene barrel. Maintanence free gell filled with a double junction reference that provides longer service life.

Bluelab Replacement pH Probe for Guardian, Combo, & pH Meter