HOBO MX Soil Moisture Loggers
Features
- Ready to deploy, with pre-attached sensors
- Easy configuration and data offload with the free HOBOconnect app
- Durable TEROS 10 soil moisture sensor lasts over 10 years in the field
- Free ground shipping
- Expedited repair and warranty service
- Lifetime technical support
- More
Overview
The Onset HOBO MX Soil Moisture Data Loggers are the industry’s only low-cost, fully integrated soil moisture loggers with Bluetooth wireless data offload. Available in two models--one that measures soil moisture (HOBO MX2306) and one that measures both soil moisture and temperature (HOBO MX2307)--these loggers are ideal for users looking for the accurate data they need to save water, improve crop yields, reduce harmful runoff, and protect ecosystems.
Mechanics
With just a mobile phone, tablet, or Windows laptop running Onset’s free HOBOconnect app, users get convenient wireless setup and data download via Bluetooth when within 100 feet of the logger – making it easy to retrieve data from hard-to-access field locations. For indoor areas, such as greenhouses, users can add the MX Gateway for remote access to data in Onset’s cloud-based HOBOlink software.
Soil Moisture: Volumetric Water Content (VWC) | |
Measurement Range |
0.00 to 0.64 m³/m³ in mineral soils 0.00 to 0.70 m³/m³ in soilless media |
Accuracy |
±0.031 m³/m³ typical in mineral soils that have solution EC <8 dS/m ±0.051 m³/m³ typical in soilless media |
Resolution |
0.001 m³/m³ |
Dielectric Measurement Frequency |
70 MHz |
Temperature Sensor (MX2307) | |
Range |
-40 to 100°C (-40 to 212°F), with tip and cable immersion in fresh water up to 50°C (122°F) for one year |
Accuracy |
±0.25°C from -40 to 0°C (±0.45 from -40 to 32°F)
±0.2°C from 0 to 70°C (±0.36 from 32 to 158°F)
±0.25°C from 70 to 100°C (±0.45 from 158 to 212°F)
|
Resolution |
0.04°C (0.072°F)
|
Drift |
<0.01°C per year (0.018°F per year)
|
Response Time |
3 minutes in air moving 1 m/s; 20 seconds in stirred water 4 minutes in air moving 1 m/s with RS3-B Solar Radiation Shield |
Logger | |
Operating Range |
-25° to 60°C (-13° to 140°F)
|
Radio Power |
1 mW (0 dBm)
|
Transmission Range |
Approximately 30.5 m (100 ft) line-of-sight |
Wireless Data Standard |
Bluetooth Low Energy (Bluetooth Smart) |
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 |
Time Accuracy |
±1 minute per month 0° to 50°C (32° to 122°F) |
Battery Type |
2/3 AA 3.6 Volt lithium, user replaceable |
Battery Life |
2 years, typical with logging interval of 1 minute and Bluetooth Always On enabled; 5 years, typical with logging interval of 1 minute and Bluetooth Always On disabled. Faster logging intervals and statistics sampling intervals, burst logging, remaining connected with the app, excessive downloads, and paging may impact battery life. |
Memory |
110,000 measurements, maximum (472 kB) |
Full Memory Download Time |
Approximately 60 seconds; may take longer the further the device is from the logger |
Dimensions |
Logger housing: 10.8 x 5.08 x 2.24 cm (4.25 x 2.0 x 0.88 in.)
Soil moisture sensor: 7.5 x 5.1 x 2.4 cm (2.95 x 2.02 x 0.95 inches)
Soil moisture sensor needle length: 5.4 cm (2.13 inches) Soil moisture sensor needle diameter: 0.32 cm (0.13 inches) Temperature sensor (MX2307) diameter: 0.53 cm (0.21 in.) Sensor cable length: 2 m (6.56 ft) |
Weight |
MX2306: 229 g (80 oz) MX2307: 267 g (94 oz) |
Materials |
Logger: Acetal, silicone gasket, stainless steel screws Soil Moisture Sensor: ASA plastic body with polyurethane epoxy filling and stainless steel pins Temperature Sensor (MX2307): Stainless steel waterproof tip Cable: PVC, UV resistant and rodent repellent (soil moisture sensor cable) |
Environmental Rating |
Temperature sensor and cable (MX2307): Immersion in water up to 50°C (122°F) for 1 year |
- HOBO MX2306 or HOBO MX2307 Data Logger with 2m cable(s) and attached sensor(s)
- HOBO MX Soil Moisture Logger Quick Start
- Screws
- Cable ties
In The News
Long-Term Monitoring in the Chautauqua Lake Watershed
With a widely developed shoreline, Chautauqua Lake experiences influxes of non-point source pollution that have historically impacted the health of the lake. The Chautauqua Lake Association (CLA) has been monitoring the lake for over two decades, reporting on changes that have occurred over the years. 
 
A pair of local lake advocates, Jane and Doug Conroe, have lived on the lake for over 40 years and have played an important role in establishing monitoring programs and facilitating consistent data collection throughout the watershed. 
 
Doug has been involved with the Chautauqua Lake Association (CLA) since the pair moved to the area in 1980, and is currently serving as the Executive Director.
Read MoreNo Red Herrings: Data Driving the Largest Salt Marsh Restoration in the NE USA
The Herring River system encompasses around 1,000 acres in the Towns of Wellfleet and Truro, Massachusetts. In 1909, the Chequessett Neck Road dike was built at the river’s mouth, drastically limiting tidal flow. Today, it’s one of the most restricted estuaries in the northeastern United States. 
 
 As a result, the area has suffered environmental decline, including poor water quality, hypoxia, lower pH, and salt marsh degradation. In 2023, the Town of Wellfleet received $14.7 million from NOAA’s Office of Habitat Conservation to fund the Herring River Restoration Project (HRRP). 
 
 Francesco Peri, President and CEO at Charybdis Group LLC, uses a network of NexSens data loggers to monitor water level and water quality on the Herring River.
Read MoreCarbon and Nutrient Monitoring in the Great Lakes Using Satellite Observations
Carbon and nutrients are the foundation of lake food webs and play an important role in the chemical and physical processes that shape aquatic ecosystems and various lake dynamics. Studying these cornerstones can help improve understanding of other lake conditions like harmful algal blooms, hypoxia, and phytoplankton community composition. 
 
The way in which these characteristics are monitored varies, though many rely on a proxy approach wherein parameters are extrapolated from the measurement of a different parameter. An assistant professor at Cleveland State University, Brice Grunert, is working to improve current strategies and take a satellite approach to monitoring the Great Lakes.
Read More