Bird Calibration Standards are used for field calibration of RF equipment. A proper calibration standard is vital for ensuring consistency and precision for your RF equipment. Bird cal standards that are built to be rugged, reliable, and easy to use. Without a calibration standard to perform measurement/field calibrations, measurements from a Cable & Antenna RF Analyers are unreliable. Measurement calibration is a fundamental practice for removing systematic errors that stem from diverse setups and internal drift. Keeping a calibration standard on hand, or 2 if you're prone to dropping or losing them, is good measurement practice.