You can also use a voltmeter to check the voltage across a single element. Click on the Volt Meter component to activate the meter. Instead of dragging the voltmeter into place, however, you must mark the positions at which you will attach the leads of the meter. As you move the cursor on the grid, a small red circle will follow it. Click once to mark the spot at which you want the negative lead of the meter (a red circle will remain at that point) and then click a second time to mark the spot for the positive lead. When both leads have been connected, an icon for the meter will appear on the grid. In addition, the value of the voltage measured by the meter will appear in the graph selected by the Volt Meter tab at the bottom of the grid. You may place only a single voltmeter onto the grid at any time.