You can use the Measure Distance Tool to measure the distance between two points. When you click the (Measure Distance Tool) from the Check panel, your cursor will turn into green crosshairs. Click where you want to start your measurement, then click where you want to end your measurement. The distance between these two points will be displayed.
There are three other measurement tools under the Measure Distance drop down menu, found by clicking the triangle to the right of the Measure Distance Tool: Measure Angle, Measure Area, and Show Point.
Measure Angle: Measure an angle by clicking to specify the three points which form the angle you want to measure.
Measure Area: Measure the area of a surface by clicking on it. The area will be displayed in the 3D viewer Window.
Show Point: Find the coordinates of a point in the 3D Viewer Window by clicking on it.
(Measure Distance Tool) from the Check panel, your cursor will turn into green crosshairs. Click where you want to start your measurement, then click where you want to end your measurement. The distance between these two points will be displayed.