Bluelab Replacement pH Probe air + water + co2 and it is 100% salt-free

and it is 100% salt-free

compliant production

Dose as needed to raise fertilizer solution to target pH

dispose of any remaining liquid down any drain and discard the canister into a trash or recycling receptacle

Connectable for variable lengths

Bluelab Replacement pH Probe air + water + co2 and it is 100% salt-freeA replacement probe for Bluelab Combo and pH Meters as well as the Bluelab Guardian Monitor. The Bluelab pH Probe is a replacement pH probe (electrode) suitable for use with Bluelab products that test the pH value of a solution. Unfortunately pH Probes do not last forever as they age through normal use and will eventually fail. With good care and use (keeping the probe tip wet and cleaning once a month) you will extend its life. The Bluelab pH Probe