HI 7010 10.01 pH Buffer Solution 1 x 500 mL bottle pH 10.01 solutions are commonly used to calibrate equipment used for analyzing basic samples. The pH 10 buffer solution is available in various forms: choose the one that best fits your application needs. HI 7007L 7.01 pH Buffer Solution1 x 500 mL bottle pH 7.01 is the most widely used among all buffer solutions. For this reason we have prepared it in a wider variety of sizes to meet every application need. Whether you prefer to have your solutions in 20 mL sachets or if you need larger quantities, HANNA instruments will satisfy all your needs.