The Hampton Nautical Brass Alidade Compass with Telescope and Bubble Level is a beautiful desktop nautical gem or can rest perfectly on a mantel or bookshelf. This solid brass alidade has a 6" arch with 3 3/4" magnetic compass. Compass needle is adjustable. On the arch 15" fully extended telescope is mounted with bubble level. Alidade is mounted on brass metal base which has 3 adjustable screws. Nice quality reproduction for surveyors to align and measure vertical and horizontal angles. Dimension: 14.5 L x 8 H inches.