This is used to set your output level, test the red and green diode lights on your Tracker2. If you toggle both the red and green, you get a yellow light on your Tracker2. You can tell this is a screen shot of a Tracker2 and not a T2-135 because the voltage and temperature do make sense. When both tone buttons are on, the tracker sends alternating mark/space tones at the specified baud rate. The ‘Sensors’ pane shows the raw readings from the on‐board sensors. The temperature reading is shown without the calibration constant applied. Calculate the difference between the actual temperature and the displayed temperature to determine the proper value for the temperature adjustment setting.