MX1104 Bluetooth data logger monitors Temperature, Relative Humidity and Light intensity of indoor environments

Convenient wireless setup and easy data download via Bluetooth Low Energy (BLE) technology, 16-bit resolution for highly-accurate measurements, New Self-Describing sensors with automatic configuration for fast deployment, Audible and visual LCD-screen alarms notify you if sensor becomes unplugged or a reading exceeds set thresholds


MX1104 bluetooth multi-channel data logger measures temperature, relative humidity, light intensity and transmits data wirelessly using bluetooth. Includes an external analog input to attach a variety of additional sensors.

Bluetooth enabled, wireless data logger lets you use your mobile device or Windows computer and Onset's free HOBOconnect app to access data, at any time, when within 100 feet of the logger. Configure the logger, read out data, view data in graphs, check the operational status of loggers, configure alarm notifications, and share data files - no other equipment is required other than a mobile device or laptop.

Add the MX Gateway for remote access to your data in our cloud-based HOBOlink software.

Contact ELFIN to learn more about the benefits of continuous indoor air quality monitoring. We can help you to be better informed of your building's indoor air quality.

Key Features

• Wireless communication via Bluetooth Low Energy (BLE) Technology
• 16-bit resolution for highly-accurate measurements
• Stores 1.9 million measurements for longer deployments between offloads
• New Self-Describing sensors with automatic configuration for fast deployment
• Compatible with existing sensors for a wide range of indoor monitoring
• Audible and visual LCD-screen alarms notify you if sensor becomes unplugged or a reading exceeds set thresholds

In what environment does this data logger operate?
This data logger operates in an indoor environment.

What measurements does this data logger support?
HOBO MX1104 data logger supports the following measurements: 4-20mA, AC Current, AC Voltage, Air Velocity, Compressed Air Flow, DC Current, DC Voltage, Dew Point, Differential Pressure, Gauge Pressure, Kilowatts (kW), Light Intensity, Relative Humidity and Temperature

 The country of origin for this product is the United States.


Temperature Sensor



-20° to 70°C (-4° to 158°F)

±0.20°C from 0° to 50°C (±0.36°F from 32° to 122°F)



0.002°C at 25°C (0.004°F at 77°F)

<0.1°C (0.18°F) per year

RH Sensor
Range 0% to 100% at -20° to 70°C (-4° to 158°F); exposure to conditions above 95% may temporarily increase the maximum RH sensor error by an additional 1%
Accuracy ±2.5% from 10% to 90% (typical) to a maximum of ±3.5% including hysteresis at 25°C (77°F); below 10% and above 90% ±5% typical
Resolution 0.01%
Drift <1% per year typical
Light Sensor


0 to 167,731 lux (15,582 lum/ft2)

Accuracy ±10% typical for direct sunlight
Logger Response Time

Temp. Response Time

RH Response Time

11 minutes in air moving 1 m/s (2.2 mph)

30 seconds to 90% in airflow of 1 m/s (2.2 mph)

Logging Operating Range -20° to 70°C (-4° to 158°F)
Transmission Range Approximately 30.5 m (100 ft) line-of-sight

Logging Rate & Modes

1 second to 18 hours, Fixed interval (normal, statistics) or burst

Memory Modes Wrap when full or stop when full
Time Accuracy ±1 minute per month at 25°C
Power Source 2 AAA 1.5 Volt alkaline batteries, user replaceable
Battery Life 1 year, typical with logging interval of 1 minute and Bluetooth Always On enabled; 2 years, typical with logging interval of 1 minute and Bluetooth Always On disabled; and temperatures between 0° and 50°C (32° and 122°F).


4 MB (1.9 million measurements, maximum)

Full Memory Download Time

Approximately 4 to 15 minutes depending on the mobile device; may take longer the further the device is from the logger

LCD LCD is visible from 0° to 50°C (32° to 122°F); the LCD may react slowly or go blank in temperatures outside this range
Size 11.28 x 5.41 x 2.92 cm (4.44 x 2.13 x 1.15 in.)
Weight 123 g
Environmental Rating IP54