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Part Number -
MX2308
HOBO MX2308 Temp/RH/PAR Data Logger
Measures Temperature, RH & Photosynthetically Active Radiation (PAR) with LI-COR PAR sensor
$595.00 USD
High-precision monitoring of PAR, temperature, and humidity with effortless Bluetooth data offload, ideal for monitoring environmental conditions—from agricultural operations to academic research.
Important Information
Requires a compatible mobile device or Windows computer and the HOBOconnect app. System requirements for the app can be found at bottom of the HOBOconnect software page.
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Compatible with
Overview
Rugged and Bluetooth-enabled, the MX2308 delivers research-grade monitoring of key growing conditions—photosynthetically active radiation (PAR), temperature and relative humidity—all in a single device. Whether you’re growing plants in a commercial greenhouse, managing indoor vertical farms, fine-tuning conditions in hydroponic systems, or conducting agricultural or ecological research, the MX2308 gives you the data you need to optimize conditions for growth, health, and productivity.
Built for simplicity and flexibility, this all-in-one logger integrates with the LI-COR® 190R PAR sensor, the industry standard for light measurement that's trusted by researchers worldwide for its precision in measuring photosynthetically active radiation (PAR).
IMPORTANT NOTE: For mounting, an M-PLT and 2003S Leveling Fixture are required. Mounting to poles or pipes require an M-BRK and 2003S.
This versatile logger is designed to operate reliably across diverse environments, from high-tech vertical farming racks to outdoor experimental plots to support informed decisions around lighting, ventilation, and irrigation without the complexity or high costs of traditional monitoring systems:
Examples of Monitoring Applications for the MX2308 Temp/RH/PAR Logger
Growers, Farmers & Producers:
Helps optimize growing conditions, improve yield consistency, and reduce disease risk for commercial greenhouse and indoor farming operators and hydroponic/aquaponic growers by monitoring where it matters most.
Researchers & Educators:
Wireless setup and data retrieval enable flexible deployment across experimental sites, with data quality ideal for agricultural researchers, plant scientists, and university programs without the budgetary or logistical barriers typical of research-grade systems.
Ag Tech & Innovation Teams:
Ease of deployment and integration-ready data formats make an ideal sensor platform for prototyping or scaled trials needed for companies innovating in lighting optimization and climate control solutions.
Setup and data retrieval are seamlessly simple—no cables or additional download devices needed using the free HOBOconnect app on your phone or tablet. Effortlessly configure the logger and download data via Bluetooth (up to a 100 ft range), which allows you to deploy in and download data from hard-to-reach spots.
Expand your remote monitoring by adding an MX Data Plan, which allows you to upload data to LI-COR Cloud remote software for further analysis, sharing, and more.
Features
Wireless Bluetooth Data Offload
Fast, easy logger setup and download via phone or tablet (up to ~100 ft range)
High-Accuracy PAR Measurements
Integrated LI-COR PAR sensor delivers research-grade light intensity readings for both sunlight and indoor grow light conditions
Integrated Temp & RH Monitoring
Logged temperature and humidity alongside PAR enables calculation of VPD for a complete view of greenhouse climate conditions
Rugged, Weatherproof Design
Durable IP67/NEMA 6 housing stands up to humid, wet, and dusty environments found in greenhouses, growth chambers, or outdoor field sites
Long Battery Life & Memory
User-replaceable battery lasts up to ~2+ years and ample data storage supports extended deployments
Alarms and Alerts
See out-of-range conditions with logger's LED readout, and configure threshold alerts using HOBOconnect for proactive monitoring
Easy Deployment
Users can deploy the logger in minutes, configure logging intervals via the HOBOconnect app, and wirelessly retrieve data (without a laptop) in the field!
Specifications
Temperature Sensor
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-40 to 65 °C (-40 to 149 °F)
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±0.2 °C (typical) within -40 to 65 °C
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0.008°C (.014 °F)
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<0.01°C (0.018°F) per year
Range
Accuracy
Resolution
Drift
Relative Humidity (RH) Sensor
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0 to 100% RH, -40° to 65 °C (-40° to 149 °F); exposure to conditions below -20°C (-4°F) or above 95% RH may temporarily increase the maximum RH sensor error by an additional 1%
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±2.5% from 10% to 90% (typical) to a maximum of ±3.5% including hysteresis at 25°C (77°F); below 10% RH and above 90% RH ±5% typical
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0.01% RH
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<1% per year typical
Range
Accuracy
Resolution
Drift
Photosynthetically Active Radiation (PAR) Sensor
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0 to 3,000 μmol/m²/s (full sunlight)
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±5% typical (LI-COR LI-190R factory calibration)
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+/-1 μmo
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0.1 μmol/m²/s
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400–700 nm (PAR waveband)
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Maximum deviation of 1% up to 3,000umol/m2 /s
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<= 2% change over one year
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±0.15% per ˚C maximum
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Cosine corrected up to 82˚ angle of incidence
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<±1% error over 360˚ at 45˚ elevation
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No error induced from orientation
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High stability silicon photovoltaic detector (blue enhanced)
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Weatherproof anodized aluminum case with acrylic diffuser and stainless steel hardware. O-ring seal on the sensor base.
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2.36 cm diameter x 3.63 cm (095” x 1.43”)
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1.8 m
Range
Accuracy
Offset
Resolution
Spectral Range
Linearity
Stability
Temperature Dependence
Cosine Correction
Azimuth
Tilt
Detector
Sensor Housing
Sensor Size
Cable Length
Calculated Metrics
Accumulated PAR in mol/m², Daily Light Integral (DLI) in mol/m²/day, Vapor Pressure Deficit (VPD) in kPa, and Dew Point (computed from logged data)
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17 minutes in air moving 1 m/sec
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24 minutes in air moving 1 m/sec
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30 seconds in air moving 1 m/sec
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40 seconds in air moving 1 m/sec
Response Time (typical, to 90% of change)
Temperature
Without Solar Radiation Shield
With RS1/M-RSA Solar Radiation Shield
RH
Without Solar Radiation Shield
With RS1/M-RSA Solar Radiation Shield
Response Time (typical, to 90% of charge)
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Without Solar Radiation Shield: 17 minutes in air moving 1 m/secWith RS1/M-RSA Solar Radiation Shield: 24 minutes in air moving 1 m/sec
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Without Solar Radiation Shield: 30 seconds in air moving 1 m/secWith RS1/M-RSA Solar Radiation Shield: 40 seconds in air moving 1 m/sec
Temperature
Relative Humidity (RH)
Logger
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-40 to 65 °C (-40 to 149 °F)
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0.4mW (-4 dBm)
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Approximately 30.5 m (100 ft) line-of-sight
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Bluetooth Low Energy (Bluetooth Smart)
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1 second to 18 hours
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Fixed interval (normal, statistics) or burst
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Wrap when full or stop when full
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Immediate, push button, date & time, or next interval
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When memory is full, push button, date & time, or after a set logging period
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±1 minute per month 0° to 50°C (32° to 122°F)
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2/3 AA 3.6 Volt lithium, user replaceable
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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 c
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195,000 measurements, maximum
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Approximately 4-5 minutes; may take longer the further the device is from the logger
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Logger housing: 10.8 x 5.08 x 2.24 cm (4.25 x 2.0 x 0.88 in.)LI-190R: 2.36 cm diameter × 3.63 cm (0.93 × 1.43 in.)
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Logger: 149 g (5.26 oz)
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Acetal, silicone gasket, stainless steel screws
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NEMA 6 and IP67
Operating Range
Radio Power
Transmission Range
Wireless Data Standard
Logging Rate
Logging Modes
Memory Modes
Start Modes
Stop Modes
Time Accuracy
Battery Type
Battery Life
Memory
Full Memory Download Time
Dimensions
Weight
Materials
Environmental Rating
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