Two digital protractors can be used to measure angles.  The first is a mini digital block that can be set almost anywhere but is harder for a class to read.

The second is about 25 cm long and has a large, back-lit display.

Brackets are attached to a Pasco track so that the protractor can be attached via its built-in magnets.  For example, this can be used to measure the angle of the track at which a wooden block will break away and start to slide.  Note that the display takes a second or two to settle on an angle value.