Bluelab Replacement pH Probe for Guardian, Combo, & pH Meter stocked - Precise external temperature sensor

- Precise external temperature sensor on 20 inch (50 cm) cable to place at plants top level: ±1

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

• LED emergency indicator light

Application: Cold-water garden and outdoor filtration

Bluelab Replacement pH Probe for Guardian, Combo, & pH Meter stocked - Precise external temperature sensorEasy 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