This aviation plotter is a double-sided printed design, easy to read the scale on each side. The sectional scale 1:500000, scale 1:1000000 and terminal area scale 1:250000. This flight plotter is fine in workmanship, using special manufacturing technology to make the printed numbers and other marks on the ruler will not fade for a long time. The navigation plotter is calibrated according to the legal ratio of miles and nautical miles, ensuring that the scale is accurate and precise. This aviation ruler allows pilots to accurately determine their flight distance and direction. This fixed plotting ruler is Perfect for aviation student training, private pilot training, search and rescue operations, and crew member training. Suitable for flight instructors use as a teaching tool to teach students how to plot and measure distances. The slide rule is made of durable plastic material, not easy to break and melt. It can withstand high temperature. Material:plastic colour:As shown Package Contents: 1 x flight plotter Only the above package content, other 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.