Turbo 2-N-1 Pro Sect Quarter ScaleThe ‘Cadillac’ of Quarter Scales. The Pro-Sect features an easy to read ruler designed in 1/16″ increments for more precise layout and an integrated 180-degree protractor to help indicate degree of angle for oval hole cuts and oval insert installation. Its one-piece, intersected design makes it the most durable and accurate layout tool for straight and perpendicular lines.