Demonstration Compass

Large classroom demonstration compass with metric and standard measurements. Use with a dry-erase marker. Great for drawing geometric patterns, measuring angles, drawing straight lines, drawing angles, etc. Suction cups to the dry-erase board to keep in place. Rotates freely on the board once suction cupped. Size: 19-3/4 in. L x 4-1/4 in. in. W. Includes guide.