THIS IS FOR A REPLACEMENT ELECTRODE not an entire unit
Optimize nutrient strength
during growth, flowering,
and fruiting
Reliable waterproof, dustproof housing and
replaceable electrode provide long life and value.
Replacement sensors:
OK-35624-09 for pHTestr 1
OK-35624-29 for pHTestr 2
OK-35653-01 pH 4.0 calibration solution