pH Pens by Hanna

These easy to use pH pens from Hanna Industries are waterproof and will float. They feature automatic shut off, temperature compensation, replaceable electrodes, hold function, stability indicator and temperature readings in either °C or °F . Choose pen with sensitivity in tenths (98127) or hundredths (98128). Pens weigh only 3 oz, measure 7” l x 2” w. Use four 1.5 V button cell batteries (included). Calibration solutions sold separately.