PurGro GroBot pH Probe, Industrial Replacement growing-accessories It provides support for beneficial

It provides support for beneficial soil microbes to enhance vigorous roots and plants and is OMRI AND OIM certified

and operates for only pennies a day

or wasting valuable electronic resources running cooling fans or other unwanted devices

Ideal as an additive for organic tea mixtures

and organic nutrients

PurGro GroBot pH Probe, Industrial Replacement growing-accessories It provides support for beneficialThese 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.