Onset HOBO® MX2305 Outdoor Bluetooth Temperature Data Logger

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  • Internal Sensor for Temperature Measurements in an Outdoor Environment
  • Wireless Transmission of Recorded Readings to Phone or Tablet Using Bluetooth Smart LE Communications
  • -40°C to 70°C Measurement Ranges with a ±0.2°C Accuracy
  • User-Replaceable Lithium Battery with 2 Year Typical Life (1 Minute Sampling Rate)
  • Stores up to 84,650 Measured Readings with Date/Time Stamp if Bluetooth Communications Not Available

Includes Screws and Zip Ties for Mounting. HOBOconnect App Available on the Apple Store (iOS) and Google Play (Android)

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Overview of the HOBO MX2305 Temperature Data Logger

The Onset HOBO MX2305 is a weatherproof temperature data logger that uses an integrated internal sensor. Utilizing the latest in Bluetooth technology, the logger can set up easily and quickly from a mobile device or a Windows computer using Onset’s free HOBOconnect app. This robust data logger is an ideal choice for any application where the device could be exposed to moisture, such as greenhouse or growing facilities. The MX2305 can monitor and record temperatures from -40°C to +70°C (-40°F to +158°F) and has a user-replaceable battery that can power the logger for up to 2 years with a 1-minute sample rate.

When used with the optional MX Gateway you can access your data in Onset’s cloud based HOBOlink software (paid service).

Onset HOBO® MX2305 Outdoor Bluetooth Temperature Data Logger Specifications

Data Channels 1 Temperature Channel
Temperature Measurement Range: -40°C to 70°C (-40°F to 158°F)
Accuracy (0°C to -70°C): ±0.2°C (±0.38°F)
Response Time: 17 Minutes typical to 90% in open air Moving 1 m/s (2.2 mph) unmounted
Resolution: 0.04°C (0.072°F)
Drift: <0.01°C (0.018°F)
Data Storage Capacity 84,650 Temperature Readings (When Bluetooth Communications Not Available)
Logging Mode Fixed Interval (Normal, Statistics) or Burst
Memory Mode Wrap when Full or Stop When Full
Start Mode Immediately, Push Button, Date & Time or Next Interval
Stop Mode Wrap When Data Storage Full, Push Button, Date & Time or After Set Interval
LED Indicators Alarm: Visual LED (Until Logger is Reconfigured or Within Limits)
Status: Green
Sampling Rate 1 Second to 18 Hours (User-Specified)
Power Source 2/3 AA 3.6 Volt Lithium Battery (User-Replaceable)
Battery Life Power Saving Mode Disabled: 2 Years typical @ 1 Minute Sampling Rate
Power Saving Mode Enabled: 5 Years typical @ 1 Minute Sampling Rate
Note: Dependant Upon Environment, Operating Range, Logging Interval, Remaining Connected with the App, Excessive Downloads and Paging My Impact Battery Life
Time Accuracy ±1 Minute per Month @ 25°C
Communications Type: Bluetooth Wireless
Wireless Data Standard: Bluetooth Smart (Bluetooth Low Energy, Bluetooth 4.0)
Transmission Range: Up to 30.5 Meters (100 ft) Line of Sight
Radio Power: 1 mW (0 dBm)
Software HOBOconnect Software App for iOS and Android
Note: Bluetooth 4.0 is Required on your Mobile Device (Phone or Tablet)
OS Compatibility Android Phones and Tablets
iPhone, iPad, iPod Touch with iOS 7.1 or Later
Bluetooth 4.0 or Later
Operating Range Temperature: -40°C to 70°C (-40°F to 158°F)
Humidity: 0 to 100% RH
Standards Compliance IP67, NEMA 6 UV Rated (Weatherproof), FCC, CE, RoHS
Environment Primarily Designed for Outdoor Usage
Materials Acetal, Silicone Gasket, Stainless Steel Bracket
Weight 75.5 grams (2.66 oz.)
Dimensions 10.8 cm x 5.08 cm x 2.24 cm (4.25" x 2.0" x 0.88")
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Customer Questions
Are the Onset MX2300 series loggers compatible with Android tablets, or do they only work with apple products?

At this time they only work with iOS devices.  We have been told that an Android version of the app is scheduled to be released shortly.  We do not have an exact release date but we were told it is expected to be released in the next 1-3 months.   

Does this support Bluetooth?

Yes, the only way to connect to this logger is with Bluetooth and using the free mobile app which is currently only available for iOS devices.  Android support is coming at the end of May.

Can I connect this device directly to my PC using USB, in case the wireless or the Bluetooth is not working?

No, the logger can only be accessed via the Bluetooth app on a mobile device.  From there you can forward the data to a desktop MAC/PC or to the cloud service. 

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