HANNA HI12301 edge® Double Junction, Gel-Filled, PEI Body pH Electrode With Temperature Sensor, With Matching Pin, Recommended For Field Applications. pH electrode for use with the Hanna edge® Multiparameter Meter. The electrodes used with edge® meter are nearly as advanced as the edge® itself: featuring a built-in microchip that stores sensor type, ID, and calibration information that is automatically retrieved by edge once the electrode is plugged in. Stored pH calibration information includes: calibrated buffers, date, time, offset and slope characteristics of the electrode. These digital electrodes also feature an easy to plug in 3.5 mm connector so you never have to worry about the right angle or aligning pin settings. Hanna @: HI12301.