This 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 cups, pH Probe Cleaner, Conductivity Probe Cleaner, a toothbrush for cleaning your pH probe, and a chamois for cleaning your conductivity probe.