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Low-cost, fully integrated soil moisture loggers with convenient Bluetooth wireless data offload.
Requires a compatible mobile device or Windows computer and the HOBOconnect app. System requirements for app can be found at bottom of HOBOconnect software page.
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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 researchers and growers looking for the accurate data they need to save water, improve crop yields, reduce harmful runoff, and protect ecosystems.
With just a mobile phone, tablet, or Windows laptop running the 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 and MX Data Plan for remote access to data with LI-COR Cloud® software.
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
For use in both mineral soils and soilless media
Sturdy, sharp stainless-steel spikes for easy installation and better soil contact
Option to view data in Percent of Field Capacity
| Property | Value |
|---|---|
| Soil moisture measurement range in mineral soils (range depends on calibration equation; sensor data can be post-calibrated if necessary) | 0.00 to 0.64 m³/m³ |
| Soil moisture measurement range in soilless media (range depends on calibration equation; sensor data can be post-calibrated if necessary) | 0.00 to 0.70 m³/m³ |
| Soil moisture accuracy in mineral soils with a solution EC <8 dS/m | ±0.031 (typical) m³/m³ |
| Soil moisture accuracy in soilless media | ±0.051 (typical) m³/m³ |
| Soil moisture resolution | 0.001 m³/m³ |
| Dielectric measurement frequency | 70 MHz |
| Temperature sensor range (with tip and cable immersed in fresh water up to 50°C / 122°F for one year) | -40 to 100°C (-40 to 212°F) |
| Temperature sensor 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) |
| Temperature sensor resolution | 0.04°C (0.072°F) |
| Temperature sensor drift | <0.01°C per year (0.018°F per year) |
| Temperature sensor response time | 3 minutes in air moving at 1 m/s; 20 seconds in stirred water; 4 minutes in air moving at 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 is full, push button, date & time, or after a set logging period |
| Time accuracy | ±1 minute per month at 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 a logging interval of 1 minute and Bluetooth Always On enabled; 5 years, typical with a logging interval of 1 minute and Bluetooth Always On disabled. Faster logging intervals and statistics sampling intervals, burst logging, remaining connected to the app, excessive downloads, and paging may affect battery life. |
| Memory | 110,000 measurements, maximum (472 kB) |
| Full memory download time | Approximately 60 seconds; may take longer the farther the device is from the logger |
| Logger dimensions | 10.8 x 5.08 x 2.24 cm (4.25 x 2.0 x 0.88 in.) |
| Soil moisture sensor dimensions | 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 diameter | 0.53 cm (0.21 in.) |
| Sensor cable length | 2 m (6.56 ft) |
| Weight | 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: Stainless steel waterproof tip; Cable: PVC, UV-resistant and rodent-repellent (soil moisture sensor cable) |
| Environmental rating | Temperature sensor and cable: Immersion in water up to 50°C (122°F) for 1 year |
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