Bluelab Replacement pH Probe for Guardian, Combo, & pH Meter spl_cp Calibration of conductivity can take

Calibration of conductivity can take as many as 16 points so acids and bases can be measured through their conductivity

and improves germination by warming the root area 10-20°F over ambient temperature

Water and nutrients travel down a 4 GPH torturous path

twist and lock

Bluelab Replacement pH Probe for Guardian, Combo, & pH Meter spl_cp Calibration of conductivity can takeEasy to clean because of its bullet shaped glass bulb. Fully waterproof and less fragile than all glass electrodes because of its tough polypropylene barrel. Gel filled (non refillable) making it maintenance free and a double junction reference providing longer life! Probe Tips All probes are interchangeable between all Bluelab products All probes carry a 6 month warranty Proper hydration of pH probes is vital to maintain wick All pH probes eventually