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The EDAN Sonotrax Basic is a high performance model with FHR digital LCD display. It has audio output which can be connected with earphones or for recording. Ultrasonic Pocket Doppler Sonotrax Basic can meet the routine examination requirements of obstetricians midwives and pregnant woman themselves. Features:* FDA CE Approved * Audio output for earphones or recording to your PC * Built-in speaker * Waterproof probe * Free carrying case included * LCD display * Auto and manual counting * Low voltage indicator * Automatically Power-offChoosing Probes:* 3 Mhz: The 3 MHz is an early term and general purpose Doppler probe. It will work very well through most full term pregnancies. A 3 Mhz is more sensitive than a 2 Mhz probe and can pick up baby’s heartbeat as early as 8-10 weeks gestation. * 2 Mhz: Designed to accommodate late term and obese pregnancies since it works best at 10 cm and larger depths.Package Includes:* Sonotrax Basic Unit * Waterproof probe * Carrying case * Ultrasonic Transmission Gel 60 grams* User ManualSpecifications:*FHR Measuring Range: 50bpm-210bpm*Resolution: 1bpm*Accuracy:+/-3bpm*Audio Sampling Frequency: 4KHz/8KHz*Recording Length: 480s/240s*