Extech PH103 4, 7 and 10 pH Tripak Buffer Pouches plus rinse solution kit
Convenient, pre-measured pH calibration solutions for your meter. Rinsing solution used for cleaning off the pH electrode before and after taking measurements to prevent contamination. 20 units/pieces included along with the item.(6 pouches of pH4 solution, 6 pouches of pH7 solution, 6 pouches of pH10 solution, 2 pouches of rinse solution).