Jeroen Smits
Sales Manager
HOBO MX2502 – Bluetooth pH and Temperature Data Logger
The HOBO MX2502 is a rugged Bluetooth Low Energy pH and temperature data logger designed for accurate water quality monitoring in both field and laboratory environments. Easily read out via smartphone or tablet.
The HOBO MX2502 pH logger from Onset is built for users who need precise, long-term water quality data without the hassle of cables or complex download tools. With Bluetooth Low Energy (BLE), all data can be accessed directly through the HOBOconnect app on iOS or Android devices.
The MX2502 delivers high accuracy, features a replaceable pH electrode, and is housed in a durable casing suitable for extended deployments in aquatic environments. It offers large onboard memory and adjustable sampling intervals, making it ideal for demanding monitoring projects.
Typical applications include:
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Aquatic ecology studies
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Water quality monitoring
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Drinking water management
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Wastewater monitoring
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Research labs and universities
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Industrial water processes
With its replaceable pH probe and automatic temperature compensation, the MX2502 is a reliable and low-maintenance solution for continuous water quality monitoring.
Technical specifications
Sensors & Measurements
Measured parameters: pH, temperature
pH range: 0–14 pH
pH accuracy: typically ±0.1 pH (depending on calibration and electrode condition)
Temperature range: –2 °C to 50 °C
Temperature accuracy: ±0.2 °C
Automatic temperature compensation
Replaceable pH electrode
Logger
Communication: Bluetooth Low Energy (BLE)
Wireless range: up to approx. 30 m (line of sight)
Memory capacity: up to approx. 100,000 samples
Logging interval: adjustable from 1 second to 18 hours
Start/stop via HOBOconnect app (iOS/Android)
Cable-free data download
Water detect logging (records submersion events)
Enclosure & Environment
Waterproof housing suitable for long-term deployment
Suitable for freshwater and saltwater
Ideal for field monitoring and lab applications
Physical
Dimensions: approx. Ø 43 mm × 183 mm
Weight: approx. 274 g
Battery: replaceable, up to ~6 years of life (depending on usage)