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Bluelab Probe Care Kit – pH & EC Calibration and KCl Storage Solutions | 8-Sachet Set ICUMSA refractometer these genuine Alexapure replacement filtersBluelab Probe Care Kit pH & EC Calibration and KCl Storage Solutions All the calibration and storage solutions your pH and conductivity probes need in one convenient kit. The Bluelab Probe Care Kit (solutions set) provides eight single use sachets covering every step of professional probe maintenance: two point pH calibration, EC conductivity verification, and KCl probe storage. Accurate probes start with fresh, uncontaminated calibration solution.