12880 S/cm Calibration Solution, 25 x 20mL, case of 25

Hanna Instruments' calibration solution, ideal for gardening, laboratory work, and field experiments, comes in a package designed to keep air and light from damaging the solution.
$34.99
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Hanna Instruments' calibration solution, ideal for gardening, laboratory work, and field experiments, comes in a package designed to keep air and light from damaging the solution.