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organic coir cube expands up to 7 times in volume when hydrated
this formulation provides qualities promoting growth and offering a delicate
Patented output control maintains maximum PAR value over lamp life
No bugs or pathogens
PurGro GroBot pH Probe, Industrial Replacement rock-bottom organic coir cube expands upThese don't look like the ones from the hydro store because they are double junction, flat surface pH probes typically used in chemical plants for process control. They last longer, stay cleaner and are built to mount in line inside your GroBot Evolution. Cost a few bucks more, but these are the good ones. Proudly made in the USA.
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