Oakton Replaceable Electrodes pH WP 2 Pen

Rep Electrode pH Tester Basic

THIS IS FOR A REPLACEMENT ELECTRODE not an entire unit
Optimize nutrient strength during growth, flowering, and fruitingReliable waterproof, dustproof housing and replaceable electrode provide long life and value.

Replacement sensors:
OK-35624-09for pHTestr 1
OK-35624-29for pHTestr 2
OK-35653-01 pH 4.0 calibration solution