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Pattern. via Amazon [amazon.com] has 2-Pack Buildsomething 10″ & 5″ Adjustable Contour Profile Gauge Set on sale for $9.99. Shipping is free w/ Prime or on orders $35+.

Product Description from store:[LIST][*]Set includes both 5″ and 10″ profile gauges; can be joined together for larger spans[*]Adjustable pin tension to reduce slipping and ensure accurate measurements[*]Metal core construction