Hanna Instruments pH Meter Hanna Instruments HI98128 pH Meter and Temperature Tester. Use the pH meter to check the pH of your water, mash, [test Star San effectiveness] and finished beer.. Hanna Instruments HI98128 pHep 5pH/Temperature Tester, 6-25/64″ Length x 1-19/32″ Width x 1″ Height
