Bluelab Replacement pH Probe for Guardian, Combo, & pH Meter stocked It has important roles in

It has important roles in the formation of new leaves

When expanded

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

• LED emergency indicator light

Bluelab Replacement pH Probe for Guardian, Combo, & pH Meter stocked It has important roles inEasy 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