Check the listing for details. Vintage Working Forestry Suppliers Spherical Crown Densiometer Concave Model C. Condition: New. Listed at 69.08 USD. Vintage Working Forestry Suppliers Spherical Crown Densiometer Concave Model C Item description from the seller Use to determine forest overstory density or as one indicator in wetland delineation workConvex Model ABuilt-in leveling bubbleOperating instructions included Convex Model A Helpful when establishing spacing standards in forest thinning and determining light requirements for regeneration. Features a mirror reflector engraved with a cross-shaped grid of 24 quarter-inch squares to delineate a plot overhead. Slightly offset convex model when using so your head does not appear in grid. Walnut instrument case is 3” x 3”. Built-in leveling bubble. Operating instructions included. Use to determine forest overstory density or as one indicator in wetland delineation work.