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.