Horiba 3-in-1 Combination pH Electrode with Built-in Temperature Sensor Model:9600-10D - PureIL, Ultrapure / Low Conductivity Water - 3200358859 The most economical option here

The most economical option here and far less fragile than glass

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Horiba 3-in-1 Combination pH Electrode with Built-in Temperature Sensor Model:9600-10D - PureIL, Ultrapure / Low Conductivity Water - 3200358859 The most economical option hereHORIBA 3 in 1 combination pH electrodes contain the pH sensing glass, the reference half cell and a temperature sensor in a single body. Because temperature is measured at the same point as pH, the meter applies automatic temperature compensation without a separate probe one connector, one electrode, correctly compensated readings. This is the range to choose from when your meter supports automatic temperature compensation. Below, the models are