Walton and Beckett Graticle for Asbestos, Electron Microscopy Sciences

Supplier: Electron Microscopy Sciences
68030-16 68029-16 68028-23 68030-19 68030-21 68028-20.4 68028-16 68028-25 68028-26 68029-19 68028-27 68028-21 68028-24.5 68028-19 68029-21
100499-248EA 779.78 CAD
103306-208 103306-206 100499-248 100499-256 100499-258 100499-262 103306-212 100499-252 100499-264 103306-210 100499-254 103306-216 100499-260 103306-214 100499-250
Walton and Beckett Graticle for Asbestos, Electron Microscopy Sciences
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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 5 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. 3 and 5 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.
IMPORTANT NOTE: The circle on these Walton & Beckett graticules must represent 100 microns at the stage and each one must be manufactured to suit the individual instrument.

Ordering information: Therefore, details should be provided with your order of: Calibration factor, if known; Objective magnification; Eyepiece magnification; Diameter of graticule disc required; Microscope make and model.

Caution: The circle on these Walton & Beckett graticules must represent 100 microns at the stage and each one must be manufactured to suit the individual instrument.
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