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

One piece greenhouse cover

height extension kit gives you the ability to increase your growing height from 6'7' to 7'7'

and can be used with a wide variety of garden soils and potting mixes

Water and nutrients travel down a 4 GPH torturous path

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