The Touch Trigger Probe (TTP) Plane Circle strategy for the Plane Auto feature measures a plane by generating hit points in a circular path. As its name suggests, this strategy takes single hits. It is available for touch trigger probes and scanning probes.
The advantage of this strategy is being able to generate a hit path according to the criteria that you specify on the strategy's tabs. You can add move points to avoid obstructions in the path.
The strategy's tabs are located in the Probe Toolbox in the Auto Feature dialog box (Insert | Feature | Auto | Plane):
For information about how to select and use measurement strategies, see "Working with Measurement Strategies".