What do I do if I get a Sensor Clearing message?

When you get a Sensor Clearing message, that means you're trying to take a sample too soon after just taking one.

You have to wait for a few moments between taking breath samples, even if you don't finish the previous sample, or even if you get an error and the sample doesn't go through. 

This allows the sensor to clear air out from the previous sample and give you an accurate reading.