Aqua Master Calibration Solution EC 1413, 500 ml case of 8, for precise EC meter calibration in hydroponics. Ensure accurate water quality monitoring.#AMT1301 #AquaMasterTools #CalibrationSolution #HydroponicSystems&Supplies #Controllers&Meters #HydroponicsTown https://www.hydroponicstown.com/amt1301-aqua-master-calibration-solution-ec-1413-500ml-case-of-8