HOBO MX2300 Bluetooth Temperature & Humidity Dataloggers

The newest bluetooth datalogger from HOBO for outdoor monitoring of temperature and humidity. The HOBO MX2300 series has a range of options with either internal or external sensors for high-accuracy measurements in harsh outdoor environments.

Key Features

  • Convenient wireless setup and download via Bluetooth Low Energy (30 meter range)
  • Retrieve data in hard-to-reach locations
  • Visual alarms alert you to out-of-range conditions
  • Compact, weatherproof housing with built-in mounting
  • View current data in real time with Onset’s free HOBOConnect app
  • Share downloaded data easily from your mobile device



  • MX2301A - Internal Combined Temperature and Humidity Sensor
  • MX2302A - External Combined Temperature & Humidity Sensor
  • MX2303 - 2 x External Temperature Sensors
  • MX2304 - 1 x External Temperature Sensor
  • MX2305 - Internal Temperature Sensor

(Note: the MX2301 & MX2302 have been replaced by the MX2301A & MX2302A with improved resolution for RH)

HOBOConnect App

Onset's free HOBOconnect app makes it fast and easy to configure compatible HOBO MX Series data loggers and manage the collected data. Just download the app from the Apple App Store or Google Play to your mobile device, or download from the Onset website to your Windows computer. With HOBOconnect, you can view data in graphs, check the operational status of loggers, share data files and graph images for analysis in Excel, Numbers, and other applications, plus store data in the cloud. HOBOconnect also lets you quickly set up audible alarm notifications, so you're immediately alerted to any problems.

  • Communicates to HOBO MX data loggers using Bluetooth (LE) technology
  • No internet connection required
  • Set data logger's name, password, logging rate, alarm threshold, start and stop time
  • Automatically upload data to Onset's cloud-based HOBOlink software to store and merge data files
  • Configure and clear audible alarms
  • Page the data logger
  • Quickly download and view data


Key Specifications

Temperature Sensor  


-40 to 70°C (MX2301, MX2302, MX2305)
-40 to 100°C (immersion up to 50°C for one year) (MX2303, MX2304)


±0.2°C from 0 to 70°C
±0.25°C from -40 to 0°C and 70 to 100°C (MX2303,MX2304)


Response Time (typical, to 90% of change) MX2301A and MX2305 internal sensors: 17 mins in air
MX2302A external sensor: 3 mins 45 secs in air
MX2303 and MX2304 external sensors: 3 mins in air; 20 secs in stirred water
RH Sensor (MX2301A, MX2302A)  
Range: 0 to 100% RH, -40° to 70°C
Accuracy: ±2.5% from 10% to 90% (typical) at 25°C; ±5% <10% RH and >90% RH typical
Resolution: 0.01%
Response Time (typical, to 90% of change)

MX2301A: 1 minute in air moving 1 m/sec
MX2302A: 15 seconds in air moving 1 m/sec

Radio Power 1 mW (0 dBm)
Transmission Range Approximately 30.5 m (100 ft) line-of-sight
Wireless Data Standard Bluetooth Smart (Bluetooth Low Energy, Bluetooth 4.0)
Battery Type 2/3 AA 3.6 Volt lithium, user replaceable
Battery Life 2 years, typical (depends on use)
Memory 128 KB (63,488 measurements, maximum)
Environmental Rating

NEMA 6 and IP67

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