The Brunton Com-pro compass clinometer is a highly advanced navigational instrument, it includes a highly accurate compass needle, spirit level operated degree finder & much more. With a body made of composite materials, this Transit is a lighter, more affordable alternative. It incorporates a cast NdFeB rare-earth magnet, precisely balanced on a sapphire bearing, resulting in a powerful magnet, which quickly seeks magnetic north and permits faster readings. The 5007 Com-Pro uses a quad dial, which goes from 0° to 90° to 0° etc. The COM-PRO comes pre-balanced for use in most of the northern hemisphere (see image of map and compass zones). However, if you are using the instrument in other countries, simply click on the image of the map, determine which country it will be used in and use the optional drop down menu above to select your compass zone. The compass will be pre-balanced for use in the selected magnetic zone by Brunton Inc in the USA, this process is free of charge but takes approximately 7 weeks, so please bear this in mind. Compasses use in the northern zone are in stock ready for despatch with very little waiting time.