United Surgical & Diagnostic offers Fetal Doppler with Battery Status and Low Power Indicator. United Surgical & Diagnostic supplies a range of Laboratory and Surgical Instruments. The Fetal Doppler with Battery Status and Low Power Indicator is compact, light and portable in design. These instruments contain built-in speaker and sound output interference. The Fetal Doppler comes with large LCD display, with back light, suitable for any illumination conditions.