Meazure provides Windows screen magnification, measurement, capture, and color sampling.
Meazure is lightweight and should run on older computers.
Meazure has a lot of features, including:
Measure objects on the screen such as images, windows, and icons Capture arbitrary portions of the screen Magnify the screen up to 32X magnification Read the color of a screen pixel in RGB, hex RGB, CMY, CMYK, HSL, YCbCr, YIQ Display rulers anywhere on the screen Display a grid overlay on the screen with an adjustable grid spacing Measure using several units including pixels, points, twips, centimeters, or user-defined Record measurements to an XML file for later playback or external processing Calibrate screen resolution to provide accurate measurements Save and restore measurement tool positions using Profiles Use predefined Profiles for common screen and video sizes such as NTSC and PAL Configure the user interface to show only the information you need