SECTION 380:50-11-4. Microscope requirements

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Laboratories shall certify that phase contrast microscopes used for fiber counting meet the specifications of NIOSH Method 7400, including verification of the microscope-resolving power by means of an HSE/NPL phase-shift test slide. All microscopes shall have been checked with a phase-shift test slide. All microscopes shall have been checked with a phase-ring centering telescope after having been moved.

[Source: Amended at 9 Ok Reg 3309, eff 7-27-92]

                    
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