PurGro GroBot pH Probe, Industrial Replacement meters-&-solutions The 24" Expander is made

The 24" Expander is made of highly reflective material and can be adjusted to 4 different positions

during winter months

the sturdy sealing arm is mounted on a thick

these fans are engineered to produce greater air movement and superior cooling no matter the application

PurGro GroBot pH Probe, Industrial Replacement meters-&-solutions The 24" Expander is madeThese 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.