The paper describes a clinometer for the accurate measurement of angles of elevation or depression up to 5° from the horizontal. The geometrical design permits a theoretical precision of ± 2″ to be attained in this range on a uniformly divided micrometer head without the application of corrections or the use of cams or associated devices. While the instrument can be read to 1″ and is sensitive to about twice this amount, no special tools or jigs were needed for its construction, beyond the equipment ordinarily available in a small machine shop.