Bluelab Replacement pH Probe for Guardian, Combo, & pH Meter featured It contains oils produced by

It contains oils produced by cold-pressed extraction of naturally grown Geranium

Onboard and cloud data logging at programmed intervals

convenient and attractive countertop displays

No calibration required for conductivity and temperature

Bluelab Replacement pH Probe for Guardian, Combo, & pH Meter featured It contains oils produced byEasy 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