---
kind: "section"
citation: "21 C.F.R. § 866.2850"
title: "21"
number: "866.2850"
heading: "Automated zone reader."
url: "https://uscodex.org/cfr/21/866.2850"
---

# §866.2850. Automated zone reader.

- (a) **Identification.** An automated zone reader is a mechanical device intended for medical purposes to measure zone diameters of microbial growth inhibition (or exhibition), such as those observed on the surface of certain culture media used in disc-agar diffusion antimicrobial susceptibility tests. The device aids in decisionmaking respecting the treatment of disease.
- (b) **Classification.** Class I (general controls).

## Notes

### Authority

Authority: 21 U.S.C. 351, 360, 360c, 360e, 360j, 360 l, 371.

### Source

Source: 47 FR 50823, Nov. 9, 1982, unless otherwise noted.