GPSForestry Solusioffers quality-made Topographic Abney Levels. Abney Levels are used in Land Surveying which consists of a fixed sighting tube, and a movable bubble level that is connected to a pointing arm, and a protractor scale. The Topographic Abney Level is easy to use, affordable, and when used correctly is a very accurate land surveying and construction tool. Topographic Abney Levels are used to measure degrees, percent of grade, topographic elevation, and chain correction. The user can use trigonometry to determine height, volume, and grade. Topographic Abney Levels are used by the surveyor and is best employed when used with a second person of the same eye height which allows for easy sighting of the level and greater accuracy.