Reddit reviews Toolmaker's “Yankee” Quick-Spring Nut, Rapid Adjust, Spring Dividers Calipers Compass, 0-4.25” / 108 mm Range, Brass Fulcrum and Fine Adjustment Mechanism, Flat Leg, C7-4
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Features quick-spring nut for rapid and precise fine adjustmentFeatures brass fulcrum and adjustment mechanismMade from high-grade carbon steel with hardened and finely polished pointsFlat leg construction makes unit very durable; has substantially hardened springMaximum opening is 4.25” / 108 mm
Toolmaker's "Yankee" Quick-Spring Nut, Rapid Adjust, Spring Dividers Calipers Compass, 0-4.25" / 108 mm Range, Brass Fulcrum and Fine Adjustment Mechanism, Flat Leg, C7-4 https://www.amazon.com/dp/B01J0BIZGU/ref=cm_sw_r_cp_tai_GVSQDbJXDYVXS
like this? It’s also called a divider and can be used in woodworking for laying out where to saw.
I like the idea to transfer distances between models to the measuring tape when its hard to get the tape in between!