摘要 |
Described herein are measuring devices that can be configured to determine a pre-set value of an object, for example, its center. The measuring devices described herein can comprise a reduced number of parts, making the devices less likely to malfunction and break down and decreasing manufacturing costs. In some embodiments, these devices can comprise a manually-operated primary moveable component, an automatically-operated intermediate component, a stationary base component and a cooperation mechanism allowing interaction of the various components. In some embodiments, these devices can continuously and automatically find the center of an object. In some embodiments, these devices can be operated with a single hand. |