# Calibrate Vision Data Access functions

This topic lists the Vision Data Access functions that get values from Calibrate Functions.

Function Functions are tools that are available in Spreadsheet for processing and analyzing acquisitions or other results. You can add functions to your Spreadsheet job to create tool chains and produce results for specific applications. | Description
GetMaxError | Returns the maximum expected error in pixels when mapping coordinates using the transform.
GetMeanError | Returns the mean expected error in pixels when mapping coordinates using the transform.
GetNFound(Structure) | Returns the number of points found for a CalibPoints data structure.
GetWorldUnits | Returns a string containing the short-hand notation of the world-units associated with the coordinate transform.
Unit of Measurement | Result String
Microns | "µm"
Millimeters | "mm"
Centimeters | "cm"
Inches | "in"