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(Note: the MX2301 & MX2302 have been replaced by the MX2301A & MX2302A with improved resolution for RH)

HOBOMobile system requirements:

  • iOS 9.2 or 9.3 or Android 4.4+
  • Bluetooth 4.0
  • NOT currently compatible with Windows Mobile devices


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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