ASA E6-B Colour Flight ComputerHigh quality aluminum E6 B manual flight planning computer. The best slide rule style flight computer on the market, now enhanced with color for even easier readability. On the circular side, black is used for the rate arrow and units to be calculated; Red is used for weight and volume; Blue is used for distance, time and temperature scales. On the wind side, colors are used to identify wind variation: blue identifies west (or right wind correction