Center/Bevel Finding Ruler
WoodRiver - Stainless Steel Center Finding Rule - 24
This 5-pc Wiggler / Center Finder Set is a great tool for setting mill / drill spindle alignment over center punch marks, existing holes and edge finding. Includes indicator holder, ball contact (0.250), wiggler body, disc contact (0.100) and needle point shaft.
Grizzly T10087 - 5-Pc Wiggler/Center Finder Set
Centering Square 4 iGaging Center Gauge Round Bar Center Finder Precision
Woodpeckers 24 Precision Woodworking Rule
Rulers, Layout & Measuring
Axminster Professional Centre Finding Rule
12 Incra Centering Rule Rockler Woodworking and Hardware
12 Centerpoint Rule Rockler Woodworking and Hardware
Centre finding rule 60cm - Robson's Tool King Store
Axminster Professional Centre Finding Rule
Slide rule - Wikipedia