I have bubbles on my EC probe. Do I need to do anything?

Air bubbles actually can cause issues when you're trying to take an EC/TDS measurement.

Air Bubbles can cause erratic readings as the sensing parts of the probes may not be completely submerged in the sample. Gently swirl the probe and/or tap the probe on the bottom of the beaker. This should be enough to dislodge any trapped bubbles.