Whether you are taking an FAA written test or flying cross country, you need the Jeppesen Metal CSG Flight Computer. The E6B computer easily calculates time, speed, distance, density altitude, true air speed and more.
The computer is made from heavy-duty metal coated in non-glare teflon for durability and accuracy. Included with purchase is a manual and carrying case.
Even in a digital world, it's nice to have a piece of equipment that isn't going to run out of battery or crash from software problems. Sure, it's analog, but the E6B is also easy to use, and you'd be hard pressed to find a better one than this.