Page:NIOSH Manual of Analytical Methods - 7400.pdf/13

 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