Detachable Stainless Steel Round Head Rotary Protractor Angle Ruler Measuring

Specification Name Detachable Stainless Steel Round Head Rotary Protractor Angle Ruler MeasuringMaterial Stainless SteelColor SilverLength 15cmAngle 0 180Size 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 Usage1 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