Normal angles, 90° x 60° x 30°, length of hypotenuse 58mm, height 32mm.

The metal box is double ended so that two sets of students can work independently with the same box.

A compact visual teaching aid which is robust in construction wood board 400x280x13mm with matt white surface, mounted on rubber feet carries a circular scale with four quadrants 0-90° graduated every 2°, with two lines at right angles.

A high quality Instrument with a resolving power of 1.5 seconds.