1. There is a spirit level on the square and protractor head. 2. 180 degree goniometer and center head. 3. The reversible protractor head is graduated. 4. Brass screw and scribe with built-in level. 5. Stainless steel ruler scales metric and imperial measurements. Colour:blue Material:Stainless steel Package Contents: 1 * Corner ruler Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.