• EDAN Sonotrax II Ultrasonic Pocket Doppler with backlit LCD display and interchangeable probes for fetal and vascular monitoring
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EDAN Sonotrax II Ultrasonic Pocket Doppler

EDAN Sonotrax II Ultrasonic Pocket Doppler

$299.00
$299.00
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The EDAN Sonotrax II is a high-performance ultrasonic pocket Doppler that provides caregivers with a cost-effective solution for routine obstetric and vascular requirements. Featuring an FHR digital LCD backlight display, interchangeable waterproof probes, and multiple heart rate processing modes, this versatile device is an ideal choice for obstetric clinics, midwifery practices, and vascular screening applications.

The Sonotrax II supports a full range of waterproof probes—including 2 MHz and 3 MHz fetal probes as well as 4 MHz, 5 MHz, and 8 MHz vascular probes—making it equally suitable for fetal heart rate detection and peripheral vascular diagnosis.

Key Features & Benefits

Versatile Probe Compatibility – Fetal & Vascular

The Sonotrax II supports a wide range of interchangeable waterproof probes for diverse clinical applications:



Probe Frequency Primary Application
2 MHz Deep penetration for late-term pregnancy and overweight patients
3 MHz Detects fetal heartbeat as early as 9 weeks
4 MHz Vascular monitoring – deepest penetration for examining blood vessels
5 MHz Vascular monitoring – balanced penetration and resolution
8 MHz Vascular monitoring – highest resolution for examining surface vessels

Large Backlit LCD Display with Clear FHR Readout

The device features a large backlight LCD display (45mm × 25mm) that clearly shows FHR values, probe type, and battery status. The backlight ensures easy reading even in low-light clinical environments, reducing eye strain during extended use.

Three FHR Processing Modes for Flexible Use

The Sonotrax II offers three heart rate processing modes to suit different clinical preferences:

  • Real-time mode – displays live fetal heart rate as it is detected

  • Average mode – displays a calculated average FHR for stable readings

  • Manual mode – allows manual counting of heartbeats

Accurate FHR Detection with High-Fidelity Sound

The Sonotrax II delivers accurate FHR detection using high-fidelity waves. The clear audio output allows clinicians to listen to fetal heart sounds with confidence, supporting accurate diagnosis and patient reassurance.

Built-in Rechargeable Battery with 4-Hour Continuous Use

The device features a built-in rechargeable battery that provides approximately 4 hours of continuous work. Some sources indicate up to 8 hours with a rechargeable Ni-MH battery. Automatic power-off conserves battery life—the device powers down 1 minute after no signal or operation.

Record & Playback Function (Sonotrax II Pro)

The Sonotrax II Pro model features audio recording and playback with a built‑in audio recorder. This allows clinicians to record fetal heart sounds and play them back for review, enhancing clinical documentation and patient communication.

Compact, Ergonomic, and Portable Design

Weighing approximately 180 g (0.7 lbs) and measuring 1.34" × 3.50" × 5.55", the Sonotrax II fits comfortably in a pocket and can be operated with one hand. Its compact design makes it ideal for busy clinical settings where portability and ease of use are essential.

Unique Charger Stand Design

The Sonotrax II features a unique charger stand design for organized storage and convenient charging. This thoughtful design keeps the device neatly arranged and always ready for use.

Audio Output for Recording and Private Listening

The Sonotrax II Pro includes an audio output that can be connected to earphones or external recorders. This enables private listening in noisy environments and allows clinicians to record fetal heart sounds for documentation or patient sharing.

Technical Specifications



Specification Detail
Device Type Ultrasonic Pocket Doppler
FHR Measurement Range 50 – 210 bpm
Resolution 1 bpm
Accuracy ±1 bpm (over 100-180 bpm)
Probe Frequencies 2 MHz, 3 MHz (fetal); 4 MHz, 5 MHz, 8 MHz (vascular)
Display 45mm × 25mm backlit LCD
Effective Radiating Area (Fetal) (245 ± 15%) mm²
Effective Radiating Area (4/5 MHz) (32 ± 15%) mm²
Effective Radiating Area (8 MHz) (14 ± 15%) mm²
Battery Built-in rechargeable (Ni-MH / Lithium)
Continuous Use ~4 hours (rechargeable) / up to 8 hours (Ni-MH)
Charge Time ~4 hours
Dimensions 1.34" × 3.50" × 5.55"
Weight ~180 g (0.7 lbs)
Probe Waterproofing Yes (all probes)
FHR Modes Real-time, Average, Manual
Automatic Power-Off Yes (1 minute after no signal or operation)
Warranty 2 years on main unit, 1 year on accessories

Sonotrax II vs. Sonotrax II Pro



Feature Sonotrax II Sonotrax II Pro
Backlit LCD Display ✓ ✓
Interchangeable Waterproof Probes ✓ ✓
Real-time / Average / Manual Modes ✓ ✓
Built-in Rechargeable Battery ✓ ✓
Automatic Power-Off ✓ ✓
Audio Recording & Playback — ✓
Audio Output (Earphone/Recorder) — ✓

Who Can Benefit from the EDAN Sonotrax II?



Specialty Application
Obstetrics & Gynecology Routine fetal heart rate monitoring from 9 weeks gestation
Midwifery Intermittent auscultation during prenatal visits and labor
Vascular Medicine Assessment of peripheral vascular and arterial diseases (with 4/5/8 MHz probes)
Primary Care Point-of-care fetal and vascular screening
General Practice Blood flow detection and vascular diagnosis

Why Choose the EDAN Sonotrax II?



Consideration Sonotrax II Solution
Versatile clinical use Supports both fetal and vascular applications with interchangeable probes
Early fetal detection 3 MHz probe detects heartbeat as early as 9 weeks
Clear visualization Large backlit LCD display for easy reading
Flexible FHR modes Real-time, averaged, and manual modes
Portable and lightweight Compact design fits in your pocket
Easy to clean Waterproof probes for simple disinfection
Cost-effective Affordable solution without compromising performance
Trusted brand 2-year warranty on main unit
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