The HOBO U12 4-External Channel Data Logger accepts a wide range of external sensors, including temperature, AC current, AC voltage, CO2, 4-20mA, and 0 - 2.5 vdc. 12-bit resolution provides great data accuracy.


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
Environment: Indoor
Measurement: AC Current
DC Voltage
AC Voltage


Measurement range: External input channels (see sensor manual): 0 to 2.5 DC Volts
Accuracy (logger only): ± 2 mV ± 2.5% of absolute reading; ± 2 mV ± 1% of reading for logger-powered sensors
Resolution: 0.6 mV
Time accuracy: ± 1 minute per month at 25°C (77°F), see Plot A
Operating range: -20 to 70°C (-4° to 158°F)
Operating temperature:
Logging: -20° to 70°C (-4° to 158°F)
Launch/readout: 0° to 50°C (32° to 122°F), per USB specification
Humidity range: 0 to 95% RH, non-condensing
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