# Using Multiple DAQ-U Together

Using multiple DAQ-U light sensors on the same computer allows you perform various functions. You can also use DAQ-M alongside DAQ-U.

## Measuring Reflectance

You can measure an object's reflectance by using 2 or more DAQ-U light sensors. When using more than one DAQ-U light sensor you do not need to scan a reference reflectance calibration target to measure reflectance, and the calibration is constantly updated as the ambient light changes. One DAQ-U measures the ambient light and another measures an object's reflectance.

Refer to the [Capture Light Sensor Data](/daq/daq-u/capturing-light-sensor-data.md) section to combine more than one DAQ-U.


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