Features: • Easy to use, already made fresh pH buffers for calibration • Helpful table printed on the pouch shows what the pH value should be vs. the temperature of the buffer solution • Rinsing solution used for cleaning off the pH electrode after taking the next measurement from a different solution to prevent contamination • Convenient 20 mL pouch eliminates the need for a cup to store buffer or rinsing solution • Includes 6 Paks of 4, 7, 10 pH Buffers, 2 Rinse Solutions