Bluelab Replacement pH Probe for Guardian, Combo, & pH Meter stocked When expanded

When expanded

• Makes 37

When germinating seeds

• Add directly to reservoir for ebb & flow or flood to drain systems

Wicking mat for auto-watering

Bluelab Replacement pH Probe for Guardian, Combo, & pH Meter stocked When expandedEasy 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