:: Product Information

HOBO USB Micro Station Data Logger

Data Loggers

Rugged and compact, the redesigned HOBO USB Micro Station is a weatherproof data logger for multi-channel monitoring of microclimates. This battery-powered station accepts up to five plug-and-play Smart Sensors and has a hinged door to make sensor installation simple and quick. The Micro Station is equipped with a built-in USB port for fast, efficient data readout to a computer, and an integrated mounting tabs for easy installation.

Highlighted Features

  • Compact size for easy deployment

  • Weatherproof IP66 enclosure for harsh environments

  • Direct USB offload--no need for an adapter cable

  • Includes five smart sensor inputs

  • Hinged door and integrated mounting tabs

  • Runs for up to a year on four standard AA batteries

  • Compatible with HOBOware and HOBOware Pro software for logger setup, graphing and analysis

In what environment does this data logger operate?

This data logger operates in indoor and outdoor environments.

What measurements does this data logger support?

The H21-USB data logger supports the following measurements: 4-20mA, Amp Hour (Ah), Barometric Pressure, DC Voltage, Kilowatt Hours (kWh), Leaf Wetness, Light Intensity, Power Factor (PF), Pulse Input, Rainfall, Relative Humidity, Soil Moisture, Temperature, Volt-Amp Reactive, Volt-Amp Reactive hour, Volt-Amps (VA), Water Flow, Watt Hours (Wh), Watts (W) and Wind

Operating Range

-20° to 50°C (-4° to 122°F) with alkaline batteries

-40 to 70°C (-40 to 158°F) with lithium batteries 

Smart Sensor Connectors


Smart Sensor Network Cable Length

100 m (328 ft) maximum

Logging Interval

1 second to 18 hours

Start Modes

Immediate, at interval, push button, or delayed start

Memory Modes

Stop when full or wrap when full


512 KB nonvolatile flash data storage

Time Accuracy

0 to 2 seconds for the first data point and ±5 seconds per week at 25°C (77°F)

Battery Type

 Four AA 1.5 V alkaline batteries for operating conditions of -20° to 50°C (-4° to 122°F); four AA 1.5 V lithium batteries for operating conditions of -40 to 70°C (-40 to 158°F)

Battery Life

1 year, typical use (up to five sensors with 1 minute or greater logging interval)

Communication Type

USB 2.0 interface

Full Memory Download Time

4 minutes

Enclosure Access

Hinged door secured by one latch with eyelet for use with user-supplied padlock


Outer enclosure: Polycarbonate/PBT blend with stainless steel hinge pins; Gaskets: Silicone rubber; Cable channel: EPDM rubber


17.04 x 11.94 x 4.47 cm (6.71 x 4.70 x 1.76 in.) see diagrams in manual

Padlock hole diameter: 0.58 cm (0.23 in.)


414g (14.6 oz.)

Environmental Rating

Weatherproof enclosure, NEMA 4X and IP66 

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