PurGro

PurGro GroBot pH Probe, Industrial Replacement

SKU: PGPHP
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These 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.