About this item
Used for counting fibrous dust including asbestos or glass fibers.
- Compares objects based on aspect ratio
- For specimens with the majority of fibers shorter than five microns
- Calibration factors are required
The Walton and Beckett graticule are used for counting fibrous dust (e.g. asbestos or glass fibers) and is particularly useful where the majority of fibers to be counted are shorter than 5 microns. The circle is divided into four by two diametrical lines scaled in units of 5 and 3 microns respectively. Three and five microns are the critical measurements of fiber lengths and diameters used in fiber counting. Unlike the usual globes of other particle graticules, the Walton and Beckett have a series of shapes to compare objects with. These shapes have been designed for comparison with fibers, especially since they incorporate an aspect ratio of 3:1 or 5:1 essential for such analysis.
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