| 摘要 |
The tool includes a body A, an end finger C and an opposing parallel sliding finger B. A spanner or socket size is read through the only window to show an exact alignment, B2. A further window B3 may be used to indicate the nearest larger size of spanner or socket if the correct size is not available. A third window B1 may be used to indicate the nearest smaller size of spanner or socket if, for example, a nut or a bolt head is damaged and requires a smaller spanner or socket to be forced over rounded corners or shoulders of the damaged head. An end stop D prevents the finger B from sliding from body A and becoming detached. A switch E may be contained in the end stop to operate a light source within the body A to illuminate the scales indicated within the windows B1 -B3. The tool may alternatively use an electrical measurement system with a digital readout for size and scale. |
