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Hobo MX2501 – Onset

pH and water temperature Bluetooth data logger, to be used with the HOBOconnect app or connectable to the MX gateway via Bluetooth


The Hobo MX2501 pH and temperature data logger is designed for long-term monitoring of pH in estuaries, lakes, streams, rivers and oceans. It communicates wirelessly via Bluetooth Low Energy (BLE) to the HOBOconnect app on your phone or tablet, making logger setup, calibration, and data offload quick and easy, with no need for extra equipment or complicated calibration procedures. Onset’s HOBOconnect app makes it a snap to configure the Hobo MX2501 logger and manage collected data in the field.
You can view data in graphs, check the operational status of loggers, share data files and graph images, and store data in the cloud.

The HOBOconnect app is a free download from the Apple App Store or Google Play! The HOBOconnect app’s built-in guided calibration feature makes an otherwise difficult task a breeze, seamlessly walking you through the pH calibration process.
Simply follow the on-screen prompts and your logger is calibrated. Built to be compact and rugged, the MX2501 logger has a replaceable pH electrode, an anti-biofouling copper guard, and a PVC housing, making it ideal for freshwater or saltwater environments. It also includes a battery-saving water detection feature for extended battery life and less maintenance.

Technical specifications

pH range: 2,00 to 12,00 pH (-512 to 512 mV)

Accuracy: ±0,10 pH units within ±10°C of temperature at calibration (±0.20 mV)

Temperature range: -2° to 50°C

Accuracy: ±0.2°C

Operating Range: -2° to 50°C — non-freezing

Waterproof: to 40 meters

Transmission range: approximately 30,50 meters line-of-sight in air

Wireless Data Standard: Bluetooth Low Energy (Bluetooth Smart)

Logging rate: 1 second to 18 hours

Battery type: one AA 1,5 Volt, user-replaceable

Battery life: 1 year typical at 25°C with logging interval of 1 minute and Bluetooth Always On selected in software.

CheckOptional with calibration

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