Onset HOBO MX Soil Moisture Loggers

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.

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
Starting At $355.00
Stock Check Availability  

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
Questions & Answers
How does the Onset HOBO MX Soil Moisture Loggers measure soil moisture?
The Onset HOBO MX Soil Moisture Loggers output soil moisture data as Volumetric Water Content (VWC) in m³/m³.
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Onset HOBO MX Soil Moisture Loggers
MX2306
HOBO MX soil moisture logger, 2m cable
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Onset HOBO MX Soil Moisture Loggers
MX2307
HOBO MX soil moisture & temperature logger, 2m cable
$415.00
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