Redesigned 4 Bevel Scales offer the precision you need. That is grip with a special recessed non-slip backing.
The satin smooth anodized finish makes holding them a pleasure.
Inch architect calibrations:
16, (1/8, 1/4), (1/2, 1), (3/4, 3/8), (3, 1-1/2), (3/32, 3/16).
Inch engineer calibrations: 10, 20, 30, 40, 50, 60.
Metric calibrations: 1:100, 1:200, 1:300, 1:400, 1:500, 1:600.

Redesigned Flat Scales offer the precision you need.
Cut-out in the middle allows for drawing lines, including parallel lines.
Inch architect calibrations:
Metric calibrations: 1:100, 1:200, 1:250, 1:300, 1:400, 1:500, 1:600, 1:800.