# Settings

Use the Settings tab to define whether the tool locates a single edge or an edge pair:

Configure the following parameters:

Parameter | Description
--- | ---
Edge Mode | Determines whether the Caliper tool searches for a single edge or an edge pair for each result.
Edge Polarity | The desired polarity for a single edge or the two edges of an edge pair.
Edge Pair Width | The distance (in units of the selected space) between each edge of an edge pair when you select Edge Pair.
Contrast Threshold | The minimum contrast required for an edge to be considered during the scoring phase.
Filter Half Size Pixels | Specifies the Filter Type of the filter.
Maximum Results | The maximum number of results to find