BLB Probe Care Kit - pH & ConductivityThis kit has everything you need to clean, calibrate, hydrate, and maintain your pH and conductivity probes. With the pH + conductivity probe cleaning kit, you will be maximizing your conductivity probe's longevity & accuracy, by keeping your probe clean, calibrated, and hydrated. Included in this kit: probe care instructions, 20ml single use Bluelab Solution sachets two each of: pH 7. 0, pH 4. 0, KCl and 2. 77 EC standard solution, three plastic