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Both filters do not change the computerized ECG interpretation
Provides improved visuals of the auditory canal and tympanic membrane
Electrical Requirements: 115 VAC nominal (126 VAC maximum - 110 VAC minimum)
Flexible no drift gooseneck
Newman DD-770 Obstetric Doppler RefurbishedVitalSigns Both filters do not changeThe DD 770 obstetric doppler provides a large, bright, back lit display of the heart rate. The display also indicates battery, volume, and signal strength status. The powerful digital processor in the DigiDop utilizes Digital Signal Clarity DSC to eliminate background noise and amplify a strong clear signal. True auto correlation calculates a fast, accurate pulse rate.