How can you calibrate the dissolved oxygen sensor? By using a water sample from a known oxygen concentration By heating the sensor in a boiling water bath By adjusting the sensor's brightness By manually entering oxygen levels

The correct answer is: By using a water sample from a known oxygen concentration.<br /><br />Calibrating a dissolved oxygen sensor involves using a water sample with a known oxygen concentration to ensure accurate measurements. This process helps the sensor accurately detect and measure the oxygen levels in the water.