pH Data Loggers & Sensors


    The HOBO MX2501 pH and Temperature Data Logger is designed for long-term monitoring of pH in estuaries, lakes, streams, rivers, and oceans. Leveraging Bluetooth Low Energy® (BLE) technology, the MX2501 pH Logger communicates wirelessly with the free HOBOconnect app and your mobile device or Windows computer, making logger setup, calibration, and data offload quick and easy. A guided pH calibration process on the HOBOconnect app makes an otherwise complicated process easier to follow. This affordable and compact logger dramatically cuts the time and effort needed to collect field data, while also offering higher resolution data. (NOTE: pH electrodes should always be stored in storage solution when not deployed.)

    You can download the HOBOconnect app here: 

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    The pHionics STs pH sensor is a submersible, water quality transmitter featuring an integrated preamp and an isolated 'true 2-wire', 4-20 ma transmitter. Compatible with Onset HOBO RX3000 weather stations, the STs pH sensor provides independent channels to simultaneously transmit a pH and temperature signal -- two wires for pH and two wires for temperature. The compact design makes the rugged sensor/transmitter ideal for applications such as process control, data acquisition, wastewater treatment, and groundwater monitoring.