... consistency, anti-aging, long life, good resistance to abrasion, and not static adsorption. The display uses a special control circuit ... devices, so it is convenient to moveand go up and down.l Stable performance, and numerous in variety: upright vertical type, tripod type, ... . 2. Unique function of hand operated to go up and down; crank device and thread are all die cast aluminum frame. 3. Software ...