The Tandem combines a liquid damped precision compass and clinometer in one compact, rugged aluminum housing that protects against impact, corrosion, and water. Clinometer scale is graduated in percent and degree (0-90, 0-150%); compass scale is in azimuth (0-360) with the option of declination adjustment (20 East and West). The compass is graduated in 1/2 increments, and the clinometer is graduated in 1/1% increments. Both the compass and clinometer are individually calibrated. Engraved inch scale and cotangent and cosine tables to 45 on the back. Threaded tripod socket. Includes carrying case and lanyard. It is used to find the orientation, and slope of objects or structures. It is also used to find the height of objects. It is used extensively in the Forestry industry, and even when setting up satellite dishes. Also used in sailing. The sight allows you to see the object and the measure at the same time.

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