A meter chart is very effective when showing a small number of values in a prominent manner. A meter chart displays a value as a needle pointer on a circular or semicircular dial. You can use a meter chart to create a gauge or dashboard display. As Figure 8‑16 shows, a meter chart resembles a speedometer, with tick marks and numbers, showing a range of values. In this example, the meter chart displays two pointers that represent two values, projected sales total and actual sales total.

You can show multiple dials in a chart, or one dial with multiple needles, by using a superimposed meter chart. For example, you can use one needle to show interior temperature, and another to show exterior temperature.