When trying to find the center on rectangular, square or even round objects it can sometimes be challenging at best. While you could always measure
Stainless Steel Center Finding Ruler. Ideal for Woodworking, Metal Work, Construction and Around The Home (24 Ruler)
Center-Finding Rule - Lee Valley Tools
Woodpeckers Woodworking Rules
Center Finder Tool
INCRA TOOLS :: Measuring, Marking & Layout :: Specialty Rules
Center Finder Multifunction XY-ruler Circle Center Marking 45°90°Scribing Gauge Metric Inchfor Woodworking Measuring Scribe Tool - AliExpress
The patented CenterPoint scale is the easy, accurate way to find center fast! There is no math or calculating involved. Just take your measurement using the top scale, then find that same number on the bottom scale. That is the center! CenterPoint rulers are excellent tools for household, workshop, or construction projects.
12 in. Stainless Steel Ruler with Patented Centerpoint Scale
24 Center Finder Rule. Graduated in 1/32 on top and 1/16 on bottom. Locate exact center between any two points.
24 Center Finder Finding Ruler Centering Tool Rule
12 Incra Centering Rule Rockler Woodworking and Hardware
STARRETT 2 Piece Combination Square Sets
TOOL STEEL QUALITY 4 Pieces Edge Finder Set Includes Ef-130,132 (Usa Fulfilled) $22.68 - PicClick
Weird metal tool with this spike that hangs freely. Found while dumpster diving. Seems to be old and hand forged : r/whatisthisthing