Alvin Accurate instrument designed for use on inclined or horizontal boards and for tracing or dotting. Sturdy joint and arm construction ensures accuracy. Bars are seasoned hardwood with clear gray lacquer finish and have die-sunk graduations, with holes carefully drilled for accuracy. Adjustable nylon ratio thumbscrews assure smooth, easy movement.
- Nickeled lead holder attachment & nylon tracer point
- Nickeled anchor table clamps provide stability