Professional Triangle Ruler & Protractor for Ship Drawing Geometry Teaching Math Set

Features:<br> High quality material, durable in use.<br> Use the stopwatch used in the hole over long distance.<br> Measure the longitude on the protractor to determine the orientation.<br> The vertice of the protractor allow for the placement of split point-or pencil at point in the hole.<br> When drawing, used to draw the load bearing line or heading-line and measure the degree of load bearing line or-heading.<br> <br> Specifications:<br> Material: Plastic<br> Length: Approx. 30cm/11.81in<br> <br> Note:<br> Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order.<br> Due to the difference between different monitors, the picture may not reflect the actual color of the item.<br> <br> Package includes:<br> 2x Triangle Rulers