Okla. Admin. Code § 380:50-11-4
Current through Vol. 42, No. 8, January 2, 2025
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.
Okla. Admin. Code § 380:50-11-4