HOBO USB Micro Weather Station and Data Logger
- Accepts up to (5) Plug-and-Play Smart Sensors for Accurate Outdoor Monitoring
- Weatherproof Enclosure to Handle Harsh Environments
- Powered By (4) AA Alkaline Batteries with 1 Year Typical Life
- Supports Measurement Averaging Based on Availability of Supporting Data from Sensor
- Measure Your Choice of Temperature, Humidity, Leaf Wetness, Rainfall, Barometric Pressure, Soil Moisture, Wind Speed & Direction, Solar Radiation, Photosynthetic Light, 0-5 Volts DC or 4-20 mA, Water Flow using Onset Smart Sensors (Sold Separately)
- Includes (4) AA Alkaline Batteries, Screws and Zip Ties for Mounting
Overview of the HOBO H21-USB Micro Station Data Logger
The Onset HOBO USB Micro Station Data Logger (H21-USB) is a rugged and compact weatherproof data logger for multi-channel monitoring a wide range of parameters. The H21-USB can accept up to 5 plug and play smart sensors (sold separately) allowing for a wide range of monitoring options. Using either the S-UCC-M001 pulse input adaptor or the S-CIA-CM14 4-20mA input opens even more options for sensors including water flow and energy consumption. More traditional sensor options include temperature, humidity, windspeed and direction, rainfall, soil moisture and more. The loggers integrated USB jack make connecting to a computer quick and easy. The logger is configured, and data is viewed using either free HOBOware or HOBOware Pro (paid) software.
For monitoring in remote locations consider the MicroRX Station which offers similar features in a device utilizing a 4G cellular connection.
For water level and flow applications we would suggest checking out the MicroRX Water Level Station which uses Onset’s own water level sensor and pre-programed water flow formulas.
Onset HOBO® H21-USB USB Micro Weather Station Specifications
Sensor Inputs | 5 |
Sampling Rate | 1 Second to 18 Hours (User Selectable) |
Operating Range | Alkaline Batteries: -20°C to 50°C (4°F to 122°F) Lithium Batteries: -40°C to 70°C (-40°F to 158°F) |
Memory | 512K Nonvolatile Flash Data Storage |
Data Storage Capacity | 51,000 Recorded Readings |
Start Modes | Immediate, At Interval, Push Button Start or Delayed Start |
Memory Modes | Stop When Full or Wrap When Full |
Time Accuracy | 0 to 2 Seconds for First Data Point ±5 Seconds per Week at 25°C (77°F) |
Materials | Outer Enclosure: Polycarbonate/PBT Blend with Stainless Steel Hinge Pins Gaskets: Silicon Rubber Cable Channel: EPDN Rubber |
Power Source | (4) Standard AA Alkaline Batteries (Included) |
Battery Life | Typically 1 Year (Up to 5 Sensors, 1 Minutes Sample Rate) |
Communications | USB 2.0 Interface |
Enclosure Access | Hinged Door Secured by 1 Latch with Eyelet for Use with User-Supplied Padlock |
Sensor Network | Cable Length: 100 meters (328 ft) Maximum |
Software Compatibility | HOBOware and HOBOware PRO Version 3.7.10+ |
OS Compatibility | Windows: Windows 11, 10 and 7 (32 and 63-Bit) Mac: OS X 10.9.x, 10.10.x and 10.11.x |
Standards Compliance | CE, IP66, NEMA 4 |
Environmental Rating | Weatherproof with Gore Vent for Deployment in Harsh Weather Conditions |
Weight | 414 g (14.6 oz.) |
Dimensions | 17.04 cm x 11.94 cm x 4.47cm (6.71" x 4.70" x 1.76") Padlock Hole Diameter: 0.58 cm (0.23") |
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Onset HOBO U-BOLT-KIT2 Saddle Clamp U-BoltsU-BOLT-KIT2$9.00
- Designed for the HOBO Micro Weather Station on Onset Tripods or Masts
- (2) 1 5/8" Saddle-Clamp U-Bolts
- Weight: 242 g (8.5 oz)
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Ultrasonic Wind Speed and Direction Smart SensorS-WCG-M003$1,099.00
- Ultrasonic Wind Speed and Direction Smart Sensor Has No Moving Parts
- Measurement Range of 0 to 92 mph (Wind Speed) and 0 to 359° (Wind Direction)
- Plug-in Modular Connector for Easy Installation
- Powered by a Built-in Solar Panel
- Compatible with Onset RX3000, U30, H21-USB and H22-001
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Onset 4-20 mA Input Adapter SensorS-CIA-CM14$105.00
- 4 to 20 mA Measurement Range
- Measurement Accuracy: ±40 µA ±0.3% of Reading
- Resolution: ±4.93 µA
- Input impedance: 124 ohms
- Provides a Trigger Signal for Controlling Power to Attached External Sensors
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Onset HOBO Barometric Pressure SensorS-BPA-CM10$189.00
- 660 mbar to 1070 mbar Measurement Range with ±3.0 mbar Accuracy
- Typical 0.6mbar Drift Per Year
- Needs Protection from Direct Exposure to Weather
- Dimensions: 1.75" x 1.875" x 0.625"
- Cable Length: 10 cm
Compatible with Onset U30 Monitoring Systems, H21-002 Micro Weather Station and H22 Energy Logger
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Onset Barometric Pressure SensorS-BPB-CM50$299.00
- Automatic Communication of Configuration Information to Data Logger without Setup
- 12-Bit Resolution with Rugged, Outdoor Rated Weatherproof Housing
- 660 to 1070 mbar Measurement Range with ±3.0 mbar Accuracy
- 1.0 mbar Drift per Year
- 50 cm Cable Length
Includes (2) Cable Ties and (2) #8 Self Tapping Screws
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Onset DC Voltage Input Adapter SensorS-VIA-CM14$109.00
- 0 to 5 Volts DC Measurement Range
- Measurement Accuracy: ±10 mV ±0.3% of Reading
- Resolution: ±1.221 millivolts
- Input impedance: 1 Megohms
- Ground connection: same for adapters and PC interface
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WattNode 208/240 VAC Delta kWh TransducerWNB-3D-240-P$407.00
- True RMS AC Watt-Hour Transducer with Pulse Output Proportional to kWh Consumed
- Solid State Relay Closure
- Line to Neutral: 120 Volts AC
- Line to Line: 208 to 240 Volts AC
- Phases: 3
- Wires: 3
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WattNode 208/240 VAC Wye kWh TransducerWNB-3Y-208-P$347.00
- True RMS AC Watt-Hour Transducer with Pulse Output Proportional to kWh Consumed
- Solid State Relay Closure
- Line to Neutral: 120 Volts AC
- Line to Line: 208 to 240 Volts AC
- Phases: 3
- Wires: 4
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WattNode 230/400 VAC Delta kWh TransducerWNB-3D-400-P$429.00
- True RMS AC Watt-Hour Transducer with Pulse Output Proportional to kWh Consumed
- Solid State Relay Closure
- Line to Neutral: 120 Volts AC
- Line to Line: 400 Volts AC
- Phases: 3
- Wires: 4
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WattNode 230/400 VAC Wye kWh TransducerWNB-3Y-400-P$407.00
- True RMS AC Watt-Hour Transducer with Pulse Output Proportional to kWh Consumed
- Solid State Relay Closure
- Line to Neutral: 230 Volts AC
- Line to Line: 400 Volts AC
- Phases: 3
- Wires: 4
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WattNode 277/480 VAC Delta kWh TransducerWNB-3D-480-P$429.00
- True RMS AC Watt-Hour Transducer with Pulse Output Proportional to kWh Consumed
- Solid State Relay Closure
- Line to Neutral: 277 Volts AC
- Line to Line: 480 Volts AC
- Phases: 3
- Wires: 3
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WattNode 277/480 VAC Wye kWh TransducerWNB-3Y-480-P$407.00
- True RMS AC Watt-Hour Transducer with Pulse Output Proportional to kWh Consumed
- Solid State Relay Closure
- Line to Neutral: 277 Volts AC
- Line to Line: 480 Volts AC
- Phases: 3
- Wires: 4
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WattNode 347/600 VAC Wye kWh TransducerWNB-3Y-600-P$429.00
- True RMS AC Watt-Hour Transducer with Pulse Output Proportional to kWh Consumed
- Solid State Relay Closure
- Line to Neutral: 347 Volts AC
- Line to Line: 600 Volts AC
- Phases: 3
- Wires: 4
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Onset Leaf Wetness Smart SensorS-LWA-M003$180.00
- Uses a Capacitive Grid (Less Sensitive to Surface Residues) to Measure Leaf Wetness
- 0 (Dry) to 100% (Wet) Measurement Range with ±5% Repeatability
- Less Than ±5% per Year Stability
- Plug-in Modular Connector for Easy Connection to Onset Micro Station or U30 Remote Systems
- 3 Meter Cable Length and 20cm Mounting Bracket
Includes Mounting Bracket, 3 Meter Cable, U-Bolts and Tie Wraps
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Onset PAR Photosynthetic Light SensorS-LIA-M003$279.00
- Measures the Light Range that Effects Photosynthesis (PAR - Photosynthetically Active Radiation)
- 400 nm to 700 nm Frequency Measurement Range with ±5 umol.m2/sec or ±5%
- -40°C to 75°C Operating Temperature Range
- Constructed of Anodized Aluminum Housing with Acrylic Diffuser and O-Ring Seal
Includes 3 Meter Cable Length
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Onset Silicon PyranometerS-LIB-M003$270.00
- Measure Solar Radiation Light Levels Using Silicon Pyranometer
- 0 to 1280 W/m2 Measurement Range over a Spectral Range of 300 to 1100 nm
- Records the Average Light Intensity over the Pre-Determined User-Set Logging Interval
- -40°C to 75°C Operating Temperature Range
- Housing Constructed of Anodized Aluminum and Acrylic Diffuser and O-Ring Seal
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Electronic Switch Pulse Input Adapter w/ 1 Meter Cable LengthS-UCC-M001$99.00
- Log and Records the Number of Switch closures per Interval
- Plug-in Modular Connector
- 3.6 Volt Maximum Input
- Weatherproof PVC Housing
- Compatible with Onset HOBO U30 Data Loggers, HOBO Micro Station and HOBO Energy Logger
Includes (2) Wire Nuts and User Manual
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Contact Closure Pulse Input Adapter w/ 1 Meter Cable LengthS-UCD-M001$99.00
- Log and Records the Number of Contact Closures per Interval
- Plug-in Modular Connector
- 3.6 Volt Maximum Input
- Weatherproof PVC Housing
- Compatible with Onset HOBO U30 Data Loggers, HOBO Micro Station and HOBO Energy Logger
Includes (2) Wire Nuts and User Manual
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Rain Gauge Smart Sensor (0.01")S-RGE-M002$269.00
- New! AeroCone® Design for Better Measurement Accuracy in High-Wind Conditions
- Cost Effective way of Measuring Rainfall on HOBO Weather Stations
- Measurement Range of 0 to 10.2cm (0 to 4in.) per Hour
- Plug-in Modular Connector for Easy Installation
- Data Stored in Sensor & Automatically Communicates to Attached Data Logger (Sold Separately)
- Compatible with Onset RX3000, U30, H21-002 and H22-001
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Rain Gauge Smart Sensor (0.2mm)S-RGF-M002$269.00
- New! AeroCone® Design for Better Measurement Accuracy in High-Wind Conditions
- Cost Effective way of Measuring Rainfall on HOBO Weather Stations
- Measurement Range of 0 to 10.2cm (0 to 4in.) per Hour
- Plug-in Modular Connector for Easy Installation
- Data Stored in Sensor & Automatically Communicates to Attached Data Logger (Sold Separately)
- Compatible with Onset RX3000 Series, U30, H21-USB and H22-001
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Onset Rain Gauge Sensor (SAE)S-RGA-M002$529.00
- Measures Rainfall up to 5.0" (12.7 cm) per Hour and Accuracy of 1.0%
- Tipping Bucket Mechanism is Mounted on a Stainless Steel Shaft with Brass Bearings
- Constructed of Aluminum Housing and Collector
- Available in English or Metric Versions
- Includes 2 Meter Cable and Brackets for Post or Tripod Mount
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Onset HOBO Temperature RH Smart Sensor w/ 2 Meter CableS-THC-M002$210.00
- 12-Bit 2 Channel Sensor for Humidity and Temperature Measurements
- Automatically Communicates Configuration Data to the Attached Data Logger (Sold Separately)
- -40°C to 75°C at 0 to 100% RH Measurement Range
- ±0.25°C (Temperature) and ±2.5% (RH) Accuracy
- Weatherproof Environmental Rating
- 2 Meter Cable Length
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Onset Soil Moisture Smart SensorS-SMD-M005$199.00
- Measures a 1-liter Volume of Soil for More Accurate Picture of Average Soil Moisture
- Sensor Uses a High Frequency Circuit for Accuracy Even in High Salinity and Sandy Soils
- ±3% Accuracy in Most Soil Conditions and ±2% with Soil Specific Calibration
- 0 to 0.570 m3/m3 (Volumetric Water Content) Measurement Range
Compatible with Onset HOBO Micro Weather Station and U30 Remote Monitoring Systems
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Onset Soil Moisture Sensor with 5 cm ProbeS-SMC-M005$199.00
- Measures Soil Water Content from 0 to 0.450 m3/m3 (0 to 45%)
- Integrates with the ECH2) Sensor and a 12-Bit A/D
- 4% Accuracy in Typical Soil Conditions and 2% in Soil-Specific Calibration
- 5 cm Probe Length and 5 Meter Cable Length
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Onset HOBO Temperature Sensor w/ 2 Meter Cable LengthS-TMB-M002$110.00
- -40°C to 100°C (-40°F to 212°F) Measurement Range
- ±0.2°C Accuracy
- Automatically Communicates Configuration Data to the Attached Logger (Sold Separately)
- Stainless Steel Sensor Tip
- Cable Length: 2 Meters
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Onset No-Lead Water Flow MeterT-MINOL-130-NL$245.00
- Measure Cold and Hot Water Flow Rates: 0.25 to 22.0 gpm
- Compatible with 3/4" Pipes and 1/2" and 1.0" with Step Downs and Step Ups (Sold Separately)
- Operating Range: 4.4"C to 82.2"C (40"F to 180"F)
- Dry Contact Reed Switch with 100mA Max Contact Rating
- 8 Digit Odometer, Meter Register May be Turned 360° for Easier Readings
- Lead Free Brass Meets the 2014 "Reduction of Lead in Drinking Water" Act Requirements
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Onset Wind Direction SensorS-WDA-M003$429.00
- Research Grade Plug-and-Play Wind Direction Sensor
- 0 to 355 Degree (5 Degree Dead Band) Measurement Range
- Average Wind Wind Direction in Sampling Interval
- Injected Molded Housing & Vane with Static Dissipating Base
- Long Sensor Life withStainless Steel Ball Bearings and Static Dissipating Housing
An Full Cross Arm (#M-CAA) or Half Cross Arm #(M-CAB) is Required for Mounting
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HOBO Wind Speed Smart SensorS-WSB-M003$299.00
- Uses 3-Cup Anemometer
- Plug-In Modular Connection
- Measurement Range: 0 to 76 m/s (0 to 170 mph)
- Accuracy: ±1.1 m/s (2.4 mph) or 4% of Reading Whichever is Greater
- Cable Length: 3 Meters
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Wind Speed and Direction Smart SensorS-WCF-M003$369.00
- Cost Effective way of Measuring Wind Speed and Direction on HOBO Weather Stations
- Measurement Range of 0 to 170 mph (Wind Speed) and 0 to 355° (Wind Direction)
- Plug-in Modular Connector for Easy Installation
- Data Stored in Sensor & Automatically Communicates to Attached Data Logger (Sold Separately)
- Compatible with Onset RX3000, U30, H21-002 and H22-001
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Wind Speed and Direction Smart Sensor SetS-WSET-B$699.00
- 2 Sensor Set Measuring Wind Speed and Wind Direction
- Measurement Range of 0 to 100 mph (Wind Speed) and 0 to 355%deg; (Wind Direction)
- Calculates Average Wind Speed, Highest 3-Second Wind Gust and Average Wind Direction
- Data Stored in Sensor & Automatically Communicates to Attached Data Logger (Sold Separately)
- Compatible with Indoor and Outdoor Environments with its Weatherproof Rating
Requires an Onset HOBO Full Cross Arm (Part #M-CAA) to Support Both Wind Sensors
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Onset Cable CaddyM-CDY$109.00
- Convenient Place to Organize and Mount Excess Sensor Cable
- Extends Sensor Cable Life by Securing Extra Cable
- Provides Convenient Location to Mount Barometric Pressure Sensor
- Dimensions: 15 cm x 10 cm x 9 cm (6" x 4" x 3.5")
- Weight: 0.3 kg (11 oz)
Includes U-Bolt and (4) Cable Ties
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Onset 3m Tripod Tower with MastM-TPA$209.00
- Specifically Designed for Use with Moderately Sloping Terrain
- Independently adjustable legs facilitate installation on moderately uneven ground
- Survival in winds up to 120 mph
Includes Mounting Holes
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Onset 3-Meter Tripod KitM-TPA-KIT$369.00This kit has everything you need for a 3-meter tripod configuration of the HOBO Weather Station or HOBO Micro Station.
- 3-meter tripod (M-TPA)
- Grounding Kit (M-GKA)
- Guy Wire Kit (M-GWA)
- 1/2" Stake Kit (M-SKA) for guy wires and tripod
- Mast Level (M-MLA)
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Onset 2m Tripod Tower with MastM-TPB$79.00
- Designed to Mount Data Loggers and/or Sensors in Weather Station Application
- Survival in winds up to 120 mph
- Note: Not Adjustable for Sloping Surfaces
Includes Mounting Holes
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Onset 2-Meter Tripod KitM-TPB-KIT$259.00This kit has everything you need for a 2-meter tripod configuration of the HOBO Weather Station or HOBO Micro Station.
- 2-meter tripod (M-TPB)
- Grounding Kit (M-GKA)
- Guy Wire Kit (M-GWA)
- 1/2" Stake Kit (M-SKA) for Guy Wires and Tripod
- Mast Level (M-MLA)
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Onset Weatherproof Protective Housing for Smart Sensor ExtensionsS-EXT-CASE2$40.00
- Protects the Connection Between the Onset Smart Sensor and Sensor Extensions
- Withstands Short-Term Underwater Submersions
- Housing Constructed of Molded PVC
- Dimensions: 16.5cm x 3.17cm (6.5" x 1.25")
- Includes Housing, Rubber Stoppers and Grip-It Lubricant
Compatible with Sensor Extension Cable (#S-EXT-M002, #S-EXT-M005, #S-EXT-M010 and S-EXT-M025)
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Onset HOBO Smart Sensor Extension CableS-EXT-M002$27.00
- Male to Male Extension Cable
- Cable Length: 2 Meters
Includes Female to Female Adapter
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Accu-CT Revenue Grade Split Core Current TransformerACTL-0750-005$77.00
- Easy to Open and Install with One Hand while Wearing Safety Gloves
- 333 mVolt AC Output at Rated Full Scale Current with No Shorting Blocks Required
- Low Phase Angle Error of ±0.50° from 1% to 120% of Rated Current
- ±0.75% from 1% to 120% of Rated Primary Current Accuracy
- 2.38" (W) x 2.40" (H) x 0.90" (T) with a 0.75" Window Opening
- 8 ft Conductor (White and Black), Twisted with 8 ft (2.4 Meters) Lead Length
Available in 5, 20, 50, 100, 200 and 250 Rated Amps
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Mini Split Core Current TransformersT-MAG-0400-05$54.00
- Split-Core Design for Fast, Easy Installation
- Internal Precision Burden Resistor
- Output: 0.333 Volts AC at Rated Current
- 8 ft Twisted Pair, 22 AWG Leads
- Operates from 50 Hz to 400 Hz
Available in 5, 10, 20, 50 and 75 Rated Amps
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Voltage Input Lead Set and CablesA-WNB-LEADSET$135.00
- Used to Wire a WattNode Terminal Block Connected to a WattNode KwH Transducer and Voltage Terminals in a Circuit Breaker Panel
- Prevents Mis-Wiring to KWH Transducer
- Designed for Single Phase (120 to 277 Volts AC) and 3 Phase (208 to 480 Volts AC) Circuits
- 25°C to 85°C Temperature Rating
- Electrical Rating: IEC 60101-031 @ 1000 Volts CAT II, 600 Volts CAT III P2
- Indulsted Nickel Plated Brass, Sheathed Banana Plug Receptable
- 5 ft Cable Length
- Includes (5) Alligator Clips with Matching Cable (Black, Blue, Green, Red and White)
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Onset NDVI Light Sensor BracketM-NDVI$29.00
- Used to Mount 2 PAR Sensors and 2 Solar Radiation Sensors on the Light Sensor Bracket for Making the Measurements Needed to Calculate the Normalized Difference Vegetation Index (NDVI)
- Dimensions: 72mm x 114mm (3.0" x 4.5")
- Weight: 62 grams (2.2 oz)
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Onset Light Sensor BracketM-LBB$50.00
- Designed for Use With Tripods, Masts or Flat Surfaces
- Used to avoid Obstructions and Shadows Affecting Measurements
- Positions PAR Sensor for Optimal Measurement Accuracy
- Attaches to Vertical surfaces or Poles 3.2 cm to 4.1cm (1.25" to 1 5/8") in External Diameter
Includes Leveling Screws
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Onset Light Sensor LevelM-LLA$50.00
- Determines if the PAR or Solar Radiation Sensor is Level
- Horizontal Circular Bubble Level: 45 Minutes per 2.5mm (0.1") Out of Center Bubble
- Tolerance or Sensitivity: ±10 Minutes
- Weight: 10 grams (0.3 oz)
- Dimensions: 3.8 cm x 3.2 cm (1.5" x 1.25")
- Constructed of PVC with Chrome-Plated Brass and Glass Level
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Onset Pre-Assembled Solar Radiation ShieldRS3-B$75.00
- Protective Shield Designed to Obtain More Accurate Temperature and Humidity Measurements in Direct Sun
- Can be Mounted on a Pole, Post or Flat Vertical Surface
- Pre-Assembled for Easy Deployment
- Multi-plate Construction for Maximum Airflow
- Enclosure Can Be Easily Opened for Offloading Data
Includes Mounting Bracket, Cable Ties, Knurled Nuts, Screws and Hose Clamp
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Onset Replaceable RH Caps with membrane and tapeHUM-RHCAP2$48.00
- (5) Replacement Humidity Caps
- Compatible with U23-002, S-THB-M002 and S-THB-M008
Includes Membrane and (5) Pieces of White Tape
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Onset 1 to 6 Adapter for Smart SensorsS-ADAPT-6$139.00
- Connect up to 6 Smart Sensors in a Water-Resistant Enclosure to 1 Sensor Extension
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Onset Full Cross ArmM-CAA$99.00
- Provides Mounting for Wind Speed and Wind Direction Sensors
- Unobstructed Wind Measurement
- Dimensions: 91.5 cm x 3.2 cm x 3.2 cm (36" x 1.25" x 1.25")
Includes Mast Mounting Hardware
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Onset Half Cross ArmM-CAB$69.00
- Provides Mounting for (1) Wind Speed or (1) Wind Direction Sensor
- Unobstructed Wind Measurement
- Dimensions: 91.5 cm x 3.2 cm x 3.2 cm (36" x 1.25" x 1.25")
Includes Mast Mounting Hardware