40 CFR 89.305 - Equipment measurement accuracy/calibration frequency.
The accuracy of measurements must be such that the maximum tolerances shown in Table 3 in appendix A of this subpart are not exceeded. Calibrate all equipment and analyzers according to the frequencies shown in Table 3 in appendix A of this subpart.
Title 40 published on 2015-08-22.
No entries appear in the Federal Register after this date, for 40 CFR Part 89.