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Optimum Hydroponix® pH 7.0 calibration solution

by Optimum
Sold out
Original price $4.50 - Original price $9.95
Original price
$4.50
$4.50 - $9.95
Current price $4.50
Calibration of pH pens requires that you use a test solution with a known pH level. Optimum Hydroproponix pH 7 offers a reliable, cost effect option.

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