The Robert Sorby Vessel Caliper was designed for internal and thin-wall measuring of bowls, urns, and goblets: the straight arm makes it especially useful for checking narrow vessels where ordinary calipers cannot reach the truth. Three sizes, 2-1/2, 5, and 10 in.

Specifications:

• Options: 2-1/2 in; 5 in; 10 in (tip of the straight leg to the set screw)
• Legs: plated steel, friction-fit adjustment; readable at either end
• Use: internal and thin-wall measurement of bowls, urns, goblets
• Made in: Sheffield, England by Robert Sorby