The Extech PH103 Tripak Buffer pouches (6 ea: 4, 7, 10pH- plus 2 Rinse Solutions) easy to use, already made fresh pH buffers are designed to be used for calibrating pH meters to ensure measurement accuracy. The PH103 features a helpful table printed on the pouch that shows what the pH value should be vs. the temperature of the buffer solution measured, a rinsing solution for cleaning the electrode before taking the next measurement to prevent contamination, and a convenient pouch that eliminates the need for a cup to store buffer or rinsing solution.