The Measure group contains the measurement and calibrate tools. You can only affect your own markups in Studio Session PDFs. It is accessed by clicking Measure on the Menu bar.
Measure Tool
Measure (M): Launches the Measure tool and opens the Measure tab.
Calibrate
Calibrate: Calibrates the document's scale to allow accurate measurements to be taken.
Length
Length (SHIFT+ALT+L): Calculates a singular linear measurement.
Polylength
Polylength (SHIFT+ALT+Q): Creates specialized markups that calculate multiple, linear measurements as well as their cumulative length.
Perimeter
Perimeter (SHIFT+ALT+P): Calculates the length of all the sides of a given shape or multi-segment line.
Area
Area (SHIFT+ALT+A): Calculates the area of a simple rectangle or of an irregular, polygonal shape.
Volume
Volume (SHIFT+ALT+V): Calculates the volume of an area with a defined depth.
Contains tools for cutting out or subtracting a polygonal or elliptical area from an existing Area or Volume measurement.
Count
Count (SHIFT+ALT+C): Places a markup for each mouse click, associating a running total of counts with each markup as it is placed.
Diameter
Diameter (SHIFT+ALT+D): Calculates the diameter of a circular shape.
Angle
Angle (SHIFT+ALT+G): Measures a given angle as defined by three points.
The radius menu contains measurement modes that calculate circle radii.
Center Radius (SHIFT+ALT+U): Calculates the radius a circle based on the position of the circle's center and one point on its circumference.
3-Point Radius (SHIFT+ALT+U): Calculates the radius as an arc.
Note: The keyboard shortcut for the radius measurement tool actually calls the most recently used radius measurement tool, either Center Radius or 3-Point Radius.