Calipers

Use Amaco's Lid Master to determine what size to make your lids to ensure a proper fit. One end measures the inside while the other end automatically measures the outside. Standard size has an 11-1/2" (292 mm) diameter capacity.

Achieve accurate proportions every time with the Derwent Scale Divider. This invaluable drawing tool makes it easy to transfer measurements from real-life, photographs, and sketches to your canvas or paper. Use the tool to scale your pictures in ratios from 4:1 to 1:4.

For accurately measuring inside or outside diameters. Lightweight steel instruments. Sizes, 8", 10", and 12".