The Shurite 7403Z is a phase meter used to measure the phase difference between two signals in audio and RF applications. It is a digital multiturn phase meter with dual line/discriminator inputs and a precision digital readout. It features a dynamic range of 0 to 360 degrees and +/-2 degree accuracy. The 7403Z also includes a range select switch, pulse output, and low-battery indication. This phase meter is suitable for use in both studio and broadcast applications.