| 摘要 |
A universal durometer (1) with improved indentation reading device, comprising a main structure (2), which is functionally associable with a specimen of material (3) whose hardness is to be measured, pusher means (4) supported by the main structure (2) and functionally connected to a penetrator (5) which can be pressed with a preset load on a test surface (6) of the specimen of material (3) along a penetration direction (7) which is substantially perpendicular to the testing surface (6) and optical reading means (17) which are functionally associated with the pusher means (4) for reading the indentation (18) left on the testing surface (6) by the penetrator (5); the optical reading means (17) comprise a main optical axis (31), which substantially coincides with the penetration direction (7), and the penetrator (5) is supported by movement means (46) for moving the penetrator (5) from the viewing field of the optical reading means (17); the durometer further comprising a plurality of optical lenses (37) which can be associated alternatively with the optical reading means (17) for varying the magnification factor of the image of the indentation (18) detected by the optical reading means (17), the optical lenses (37) being functionally supported by selection means (38) for positioning one of the optical lenses (37) along the main optical axis (31).
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