With Bluelab's® pH probe cleaning kit, you have everything you need to clean, calibrate, and hydrate your probes. The pH probe care kit comes with probe care instructions, 20 ml single-use Bluelab® Solution Sachets - two each of: pH 7.0, pH 4.0 and KCl solutions, three plastic cups, a Bluelab® pH Probe Cleaner, and a toothbrush for cleaning your pH probe.