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ASBESTOS and OTHER FIBERS by PCM: METHOD 7400, Issue 2, dated 15 August 1994 - Page 13 of 15
APPENDIX B. COMPARISON OF COUNTING RULES Figure 2 shows a Walton-Beckett graticule as seen through the microscope. The rules will be discussed as they apply to the labeled objects in the figure.
Figure 2. Walton-Beckett graticule with fibers.
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition
