HOBO H21-USB Micro Station Data Logger

Temperature and RH measurements.

Temp, and water temp measurements, stainless steel sensor tip and robust cable, 2m, 6m and 17m length options.

Adds the ability for users to be able to measure compressed air flow (SCFM), fits 1 inch or 2 inch steel pipes.

True RMS up to the 21st harmonic 60 Hz, One to three phase AC system.

Measures 1, 2, or 3 phases in 2, 3, or 4 wire configurations, pulse output, use with wide variety of CT's.

300-amp sensors, split-core installation eliminates the need to remove conductors, accurate electronic pulse output.

Measures up to 3 separate branch circuits simultaneously, accurate measurement of multiple single phase or each phase of 3-phase configurations.

Measures 1, 2, or 3 phases in 2, 3, or 4 wire configurations.

Connects sensors with pulse outputs to loggers with smart-sensor inputs.

Connects sensors with pulse outputs to loggers with smart-sensor inputs, compatible with contact closures.

Digital filtering improves measurement accuracy with 32 readings/sample, 12-bit resolution.

Interfaces with any sensor providing a 4-20 mA signal to connect to smart sensor compatible data loggers.

Barometric Pressure Smart Sensor for use with the HOBO Remote Monitoring Station Data Loggers.

Measurement range: 0 (dry) to 100% (wet), capacitive grid sensor type.

Photosynthetically Active Radiation (PAR) Smart Sensor, designed to detect photons between 400-700 nm in wave length.

Solar Radiation (Silicon Pyranometer) Sensor, measurement range: 0 to 1280 W/m².

0.2 mm Rainfall (2m cable) Smart Sensor, measures rainfall rates up to 12.7 cm per hour.

0.01" Rain Gauge (2m cable) Smart Sensor, measures rainfall rates up to five inches per hour.

Sensor uses a high-frequency (70 MHz) circuit that provides good accuracy even in high-salinity and sandy soils.

Measures a large 1-liter volume of soil, providing a more accurate picture of average soil moisture.

Research-grade plug-and-play sensor for measuring and logging wind direction data.

Measure wind speed from 0 to 76 m/s (0 to 170 mph), sensor survives through 170 mph.

Set includes research-grade plug-and-play Wind Speed Smart Sensor and the Wind Direction Smart Sensor.

Connects the R.M. Young Wind Monitor-AQ Sensor (model 05305) with Onset's line of research-grade weather stations.

Connects the R.M. Young Marine Wind Monitor Sensor (model 05106) with Onset's line of research-grade weather stations.

Ultrasonic wind, speed and direction smart sensor, plug-and-play with HOBO stations.