6 mm Monochrome LED Signs Clear, instantly-recognizable messages from one of the most reliable and rugged digital displays to hit the railway market, the AF-6700 series 6 mm monochrome LED display withstands the test of time and weather with a durable cabinet built to endure outdoor elements and resist brake dust. Technical Specifications Pixel pitch: 6 mm (0.24") center-to-center Color capability: Monochrome (amber) LEDs per pixel: 1 amber |