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This part number is just for a replacement electrode for your Oakton pH WP 2 pen, not the actual unit itself.
Optimize nutrient strength during growth, flowering, and fruiting. Reliable waterproof, dustproof housing and replaceable electrode provide long life and value, meaning you won't need to invest in or calibrate another Oakton pen once you've become comfortable using yours.
Item Number: 131979
Manufacturer's Part Number: WD-35624-29