Onset HOBO MX Temp/RH Logger
Features
- Stores 84,000 measurements
- Easy to deploy and offload using the free HOBOconnect app
- Visual and audible high & low alarm thresholds
- Expedited repair and warranty service
- Lifetime technical support
- More
Overview
The Onset HOBO MX1101 data logger measures and transmits temperature and relative humidity data wirelessly to mobile devices or Windows computers via Bluetooth Low Energy (BLE) technology. Add the MX Gateway for remote access to data in Onset's cloud-based HOBOlink software.
Mechanics
The self-contained wireless data logger works with a mobile device or Windows computer and Onset's free HOBOconnect app so users can configure the logger and read out data over a 100-foot range, with no other dedicated equipment required. Using Onset's free app, users can also view data in graphs, check the operational status of loggers, configure alarm notifications, and share data files.
Temperature Sensor | |
Range | -20° to 70°C (-4° to 158°F) |
Accuracy | ±0.21°C from 0° to 50°C (±0.38°F from 32° to 122°F) |
Resolution | 0.024°C at 25°C (0.04°F at 77°F) |
Drift | <0.1°C (0.18°F) per year |
RH Sensor* | |
Range | 1% to 90%, non-condensing |
Accuracy | ±2.0% from 20% RH to 80% RH typical to a maximum of ±4.5% including hysteresis at 25˚C (77˚F); below 20% RH and above 80% RH ±6% typical |
Resolution | 0.01% |
Drift | <1% per year typical |
Response Time | |
Temperature | 7:30 minutes in air moving 1 m/s (2.2 mph) |
RH | 20 seconds to 90% in airflow of 1 m/s (2.2 mph) |
Logger | |
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) |
Logger Operating Range | -20° to 70°C (-4° to 158°F); 0 to 95% RH (non-condensing) |
Logging Rate | 1 second to 18 hours |
Logging Modes | Fixed interval (normal, statistics) or burst |
Memory Modes | Wrap when full or stop when full |
Start Modes | Immediate, push button, date & time, or next interval |
Stop Modes | When memory full, push button, date & time, or after a set logging period |
Restart Mode | Push button |
Time Accuracy | ±1 minute per month at 25°C (77°F) |
Battery Life | 1 year, typical with logging interval of 1 minute. Faster logging and/or statistics sampling intervals, entering burst logging mode, and remaining connected with the app will impact battery life. Excessive readouts, audible alarms, and paging all impact battery life. Visual alarms and other events can have a marginal impact on battery life. |
Battery Type | Two AAA 1.5 V alkaline batteries, user replaceable |
Memory | 128 KB (84,650 measurements, maximum) |
Full Memory Download Time | Approximately 60 seconds; 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 | 3.66 x 8.48 x 2.29 cm (1.44 x 3.34 x 0.9 in.) |
Weight | 56 g (1.98 oz) |
Environmental Rating | IP50 |
- HOBO MX1101 Temp/RH Data Logger
- Command strip
- Double-sided tape
- Hook & loop strap
- Two AAA 1.5 V alkaline batteries
In The News
2025 Essential Water Monitoring Gear
Stay ahead of the curve with five of the top water monitoring products for 2025. Technological advancements and manufacturing innovations are leading to better quality data, improved price points, and enhanced user experience. And, while the ‘essentials’ list includes several new products, two tried-and-true measurement instruments continue to take a top spot for portable instrumentation. 
 
 These five products were developed by industry-leading suppliers, and in addition to extensive manufacturer testing, our science team tested and verified each instrument’s performance at the Fondriest Center for Environmental Studies .
Read MoreYSI ProDSS Multi-parameter Water Quality Meter Review
There's no shortage of options when it comes to water quality monitoring equipment. If you're looking for an all-in-one multi-parameter sampling meter, then the YSI ProDSS is a prime choice. Along with its field-rugged construction, backlit display, rechargeable battery, a wide selection of cable lengths and a long list of measurement parameters, the meter offers the latest in smart sensor technology. 
 
 Constructed of titanium and laser welded, the smart sensors offer superior performance in fresh, brackish and saltwater applications. Upon connection, the smart sensors are automatically displayed on the meter. With internally stored calibration constants, any sensor can plug into any port and provide accurate data in just seconds.
Read MoreMonitoring Hurricanes and Predicting Flooding in the Age of Climate Change
Still recovering from Hurricane Helene, which caused extreme precipitation, flooding, landslides, and other environmental disasters associated with severe weather, the southeastern part of the U.S. is predicted to be hit by another storm, Hurricane Milton. 
 
With Hurricane Helene having made landfall only a little over a week ago on September 27 th , many communities are still recovering. ABC reports that over 230 people have been killed as a result of flooding and destruction caused by Helene, with many still missing. 
 
Residents in these heavily impacted states, such as Florida, Georgia, South Carolina, North Carolina, Virginia and Tennessee, are still searching through the rubble of homes, urban centers, and hospitals for loved ones and belongings.
Read More