PurGro GroBot pH Probe, Industrial Replacement rock-bottom Solid state electronic ignition module—no

Solid state electronic ignition module—no pilot light necessary

Patented output control maintains maximum PAR value over lamp life

Canadian Sphagnum peat moss (65-75 % / volume)

this formulation provides qualities promoting growth and offering a delicate

PurGro GroBot pH Probe, Industrial Replacement rock-bottom Solid state electronic ignition module—noThese 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.