ITEM NAME:Electronic Protractor Ruler Digital Goniometer Angle Mat J7L1 Gauge Miter F L4W2 description: 100% new high quality Detecting the deviation of the right and left (yin and yang) right angles on the object Detect the verticality and levelness of the general plane The function of the square of the inspection room (normal error value is within 5 mm): Measure whether the wall facade is at a 90 degree angle vertical Measure whether the wall surface is perpendicular to the ground at a positive 90 degree angle. Color as shown Material: aluminum alloy Size: Approx.200*40*15mm Measuring range: Â ±5/150mm Accuracy error: Â ±0.5mm Uses: It is suitable for verticality inspection of machine tools, mechanical equipment and parts, positioning of installation and machining, detecting the verticality of the workpiece and the verticality of the relative position of the workpiece. Packing: 1* Measuring scale.The verticality of the relative position of the workpiece. Material: aluminum alloy. Color as shown.