This is the ULTIMATE Satellite Finding Tool.The Tandem is a rugged, compact instrument that will allow you to take both slope/height measurements and compass bearings. It is excellent for finding Satellites. Its aluminum housing is corrosion and water resistant. The clinometer scale is in percent and degree (0-90 deg., 0-150%) while the compass scale is 0-360 deg. The clinometer and compass are graduated in 1/2 deg./1% increments and each is individually calibrated for an accuracy of +/- 0.25 deg. 1/4"-20 threaded mount for camera tripod, carrying case and neck lanyard.
Suunto Tandem User Guide