The HOBO U12 Temperature/Relative Humidity/2 External Data Logger contains internal sensors for monitoring two common indoor parameters. Two external channels accept a wide range of external sensors, including temperature, AC current, AC voltage, CO2, 4-20mA, and DC voltage cables.

Features:

12-bit resolution provides high accuracy
Large memory for long-term deployments or fast sampling
Five models to choose from, with flexible measurement options
Programmable and push button start
 
Measurement:

AC Current
Temperature
Relative Humidity
DC Voltage
4-20mA
AC Voltage
Carbon Dioxide

specifications:

Measurement range:
Temperature: -20° to 70°C (-4° to 158°F)
RH: 5% to 95% RH
External input channel (see sensor manual): 0 to 2.5 DC Volts
Accuracy:
Temperature: ± 0.35°C from 0° to 50°C (± 0.63°F from 32° to 122°F), see Plot A
RH: ±2.5% from 10% to 90% RH (typical), to a maximum of ±3.5%, see Plot B
External input channel (see sensor manual): ± 2 mV ± 2.5% of absolute reading
Resolution:
Temperature: 0.03°C at 25°C (0.05°F at 77°F), see Plot A
RH: 0.03% RH
Drift: Temperature: 0.1°C/year (0.2°F/year)
RH: <1% per year typical; RH hysteresis 1%
Time accuracy:
± 1 minute per month at 25°C (77°F), see Plot C
Response time in airflow of 1 m/s (2.2 mph)
Temperature: 6 minutes, typical to 90%
RH: 1 minute, typical to 90%
Operating temperature:
Logging: -20° to 70°C (-4° to 158°F)
Launch/readout: 0° to 50°C (32° to 122°F), per USB specification
Battery life:1 year typical use
Memory:64K bytes (43,000 12-bit measurements)
Weight:46 g (1.6 oz)
Dimensions:58 x 74 x 22 mm (2.3 x 2.9 x 0.9 inches)
The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).

Producing Area:USA