HOBO MX2308 Wireless Temperature, Humidity & PAR Data Logger - Optional Remote Monitoring
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High-precision monitoring of PAR, temperature, and humidity with effortless Bluetooth data offload, ideal for monitoring environmental conditions—from agricultural operations to academic research.
Communications
Access your data directly from your mobile phone, tablet or Windows computer when within 100 foot (30 m) line-of-sight range of the logger, with the free HOBOconnect app.
To enable cloud data storage and analysis, add an MX Data Plan (select from the options above).
To enable near real-time remote monitoring and alerts via email or text message, add an MX Data Plan and an MX Gateway (select from the options above). Note: the MX Gateway must be indoors.
You can download the HOBOconnect app here:
| Power (Outdoor Unit) | Battery only |
|---|---|
| Batteries (Outdoor Unit) | 2/3 AA 3.6 Volt lithium (included). User-replaceable. |
| HOBO Product Series | MX2300 |
| Measurements | Dew Point, Humidity, PAR/Quantum Light, Temperature |
| Data Available By | Online, Mobile App, WiFi, Email, Ethernet, Wireless (Bluetooth/RF) |
Specifications
Temperature Sensor
Range
-
-40 to 65 °C (-40 to 149 °F)
Accuracy
-
±0.2 °C (typical) within -40 to 65 °C
Resolution
-
0.008°C (.014 °F)
Drift
-
<0.01°C (0.018°F) per year
Relative Humidity (RH) Sensor
Range
-
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%
Accuracy
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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
Resolution
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0.01% RH
Drift
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<1% per year typical
Photosynthetically Active Radiation (PAR) Sensor
Range
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0 to 3,000 μmol/m²/s (full sunlight)
Accuracy
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±5% typical (LI-COR LI-190R factory calibration)
Offset
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+/-1 μmo
Resolution
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0.1 μmol/m²/s
Spectral Range
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400–700 nm (PAR waveband)
Linearity
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Maximum deviation of 1% up to 3,000umol/m2 /s
Stability
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<= 2% change over one year
Temperature Dependence
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±0.15% per ˚C maximum
Cosine Correction
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Cosine corrected up to 82˚ angle of incidence
Azimuth
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<±1% error over 360˚ at 45˚ elevation
Tilt
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No error induced from orientation
Detector
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High stability silicon photovoltaic detector (blue enhanced)
Sensor Housing
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Weatherproof anodized aluminum case with acrylic diffuser and stainless steel hardware. O-ring seal on the sensor base.
Sensor Size
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2.36 cm diameter x 3.63 cm (095” x 1.43”)
Cable Length
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1.8 m
Calculated Metrics
Response Time (typical, to 90% of change)
Temperature
Without Solar Radiation Shield
-
17 minutes in air moving 1 m/sec
With RS1/M-RSA Solar Radiation Shield
-
24 minutes in air moving 1 m/sec
RH
Without Solar Radiation Shield
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30 seconds in air moving 1 m/sec
With RS1/M-RSA Solar Radiation Shield
-
40 seconds in air moving 1 m/sec
Response Time (typical, to 90% of charge)
Temperature
-
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
Relative Humidity (RH)
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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
Logger
Operating Range
-
-40 to 65 °C (-40 to 149 °F)
Radio Power
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0.4mW (-4 dBm)
Transmission Range
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Approximately 30.5 m (100 ft) line-of-sight
Wireless Data Standard
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Bluetooth Low Energy (Bluetooth Smart)
Logging Rate
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1 second to 18 hours
Logging Modes
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Fixed interval (normal, statistics) or burst
Memory Modes
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Wrap when full or stop when full
Start Modes
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Immediate, push button, date & time, or next interval
Stop Modes
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When memory is full, push button, date & time, or after a set logging period
Time Accuracy
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±1 minute per month 0° to 50°C (32° to 122°F)
Battery Type
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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 c
Memory
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195,000 measurements, maximum
Full Memory Download Time
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Approximately 4-5 minutes; may take longer the further the device is from the logger
Dimensions
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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.)
Weight
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Logger: 149 g (5.26 oz)
Materials
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Acetal, silicone gasket, stainless steel screws
Environmental Rating
-
NEMA 6 and IP67
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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 optimise 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). 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.
Key Features
All-in-one Environmental Monitoring - Measures temp, RH, and PAR with research-grade accuracy.
Derived parameters - Calculates key metrics like Daily Light Integra (DLI) and Vapor Pressure Deficit (VPD) to optimize crop health and yield.
Wireless Bluetooth Data Offload - Fast, easy logger setup and download via phone or tablet (up to ~100 ft range).
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!
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.
Requires a compatible mobile device or Windows computer and the HOBOconnect app.