Detachable Stainless Steel Round Head Rotary Protractor Angle Ruler Measuring

Specification:
Name: Detachable Stainless Steel Round Head Rotary Protractor Angle Ruler Measuring Material: Stainless Steel Color: Silver Length: 15cm Angle: 0ﾣ - 180ﾣ Size: As picture shown Features: Made of stainless steel material, high precision, accuracy, durable. Suitable for wood building, mapping, designing, etc. For a simple measurement of the angle and length. The reading of dials 0-180 degrees, foot long strip divided 15cm. Laser engraving, clear reading. Angle ruler combined screwing, the screws can be easily disassembled. Usage 1. ZERO: loose screw and to turn handle ruler, then keep the handle ruler in the same level as the bottom of main plate. Start line must be on 0 position. The way you can revise the protractor whether it is accurate or not. 2. Measure Angle: loose screw, the subject put on the bottom of main plate handle ruler match to it, close the screw. After reading base line position on main plate. 3. Measure Width: 0-30 metric system on the bottom of main plate. Base line put on 90 position, the subject match to handle ruler, bottom of main plate. 4. Measure Depth: handle ruler put on the cave or match the subject. 5. Draw Line: loose screw, handle ruler adjust correct angle you would like, fix crew. Then you can draw lines on it. Package included:
1 Pcs Angle Protractor Ruler