For acid-base experiments, eight indicators are available on the lab bench. Colors for each indicator as a function of pH are shown on the indicator chart. Clicking on the chart brings up a new window with the indicator chart enlarged for easy viewing. An indicator can only be added to a beaker while it is on the stir plate and only one indicator can be added. An indicator is added by either dragging the dropper to the beaker on the stir plate or double-clicking on the selected indicator.