Radius gauges require a bright light behind the object to be measured. The gauge is placed against the edge to be checked and any light leakage between the blade and edge indicates a mismatch that requires correction.
Every leaf has a different radius, for example with radius intervals of 0.25 mm or 0.5 mm. The material of the leaves is stainless steel. Each gauge is one of two types; either internal or external, which are used to check the radius of inner and outer surfaces, respectively.
- Frane 1994, p. 128.
- Frane 1994, p. 281.
- Kennedy, Hoffman & Bond 1987, p. 233.
- TIP-ordboka (Norwegian technical mechanical dictionary)
- Frane, James T. (1994), Craftsman's Illustrated Dictionary of Construction Terms (Illustrated ed.), Craftsman Book Company, ISBN 978-1-57218-008-6.
- Kennedy, Clifford W.; Hoffman, Edward G.; Bond, Steven D. (1987), Inspection and Gaging (6th, Illustrated ed.), Industrial Press Inc., ISBN 978-0-8311-1149-6.