A spherical crown densiometer, convex, is a specialized forestry tool used for measuring the canopy cover or foliage density in a forest or other vegetated area. It is particularly useful in forest ecology and management for assessing the degree of canopy closure. Canopy closure is an important metric in forestry because it affects factors like light penetration, plant growth, and habitat for wildlife. The term "convex" likely refers to the shape of the densiometer. Convex densiometers have a spherical or dome-shaped lens that you look through to assess canopy cover. When you look through the densiometer, you can see how much of the canopy is visible through the lens, and this information can be used to estimate the canopy cover percentage. It works on the principle that the more closed the canopy is, the less of it you can see through the densiometer. Forestry Suppliers is a company that provides various tools, equipment, and supplies for professionals working in forestry, environmental science, and related fields. They offer a range of forestry tools, including densiometers, for those who need to assess forest canopy cover and other ecological parameters. The specific product you mentioned, the "Forestry Suppliers Spherical Crown Densiometer, Convex," is a particular model or product they may offer for this purpose. This densiometer is likely designed to help foresters and ecologists obtain accurate canopy cover measurements in their fieldwork, which is important for forest management, wildlife habitat assessment, and ecological research. The convex lens helps to create a precise measurement of canopy closure by blocking the line of sight through the canopy and providing an estimation of the percentage of canopy cover in the area being observed.