An Antibiotic Zone Reader is a precision microbiological instrument designed to measure the diameter of inhibition zones formed around antibiotic discs during antimicrobial susceptibility testing (AST). It ensures accurate and repeatable measurement of zone diameters in millimeters, supporting standardized interpretation of bacterial resistance patterns.

The instrument features a magnified illuminated viewing platform and a calibrated measurement scale or digital readout system for precise evaluation. It is widely used in pharmaceutical quality control laboratories, clinical microbiology labs, hospitals, research institutions, and academic laboratories.

This device enhances accuracy in Kirby–Bauer disc diffusion testing and complies with standard microbiological testing protocols.