The Onset MX2501 HOBO Bluetooth Low Energy 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, Onset's MX2501 pH Logger communicates wirelessly with the free HOBOmobile app on iOS devices, making logger setup, calibration, and data offload quick and easy. A guided pH calibration process on the HOBOmobile app makes an otherwise complicated process easier to follow. The MX2501 logger dramatically cuts the time and effort needed to collect field data, while also offering higher resolution in data.
Designed for long-term monitoring of pH in aquatic systems
Accuracy of ±0.10 pH units within ±10°C of temperature at calibration
User-replaceable pH electrode and anti-biofouling copper guard
Rugged PVC housing can be deployed in both fresh and salt water environments
Potentiometric pH electrode with plastic body, gel electrolyte, and double cloth junction
Bluetooth Low Energy-enabled for wireless communication with mobile devices
Guided pH calibration following on-screen prompts in HOBOmobile app
Easily calibrate and configure logger, download logged data to your phone or tablet, or automatically upload data to HOBOlink for further analysis using HOBOmobile app
Configure logger to calculate statistics, set up alarms to trip at specific thresholds, or enable burst logging in which sensor readings are logged at faster intervals when pH or temperature rises above, or falls below certain limits
Water detection system for longer battery life and less maintenance
NOTE: pH electrodes should always be stored in storage solution when not deployed