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Gently used MAS Baby Watcher fetal heart rate Doppler. My midwife owns the same one! I heard my babies heart rate at 9 weeks! Most mommies can hear it between 8-12 weeks. I loved the LCD display so I could see what the heart rate was on the screen. This Doppler is very easy to use, lightweight, portable and has no interference or static. I bought this a few years ago from another MDC'er. The battery cover is missing, and there are a few light scratches on the display. This in no way affects the functionality at all. That's why the low price! $150 including shipping! WILL ACCEPT OFFERS!

• Display LCD
• Low Battery Display
• Signal Quality Display
• Heart Rate Range 40-248 bpm
• Accuracy ± 2%
• Ultrasound Frequency 2MHz
• Ultrasound Intensity (8.8 +/- 4.9) mW/cm2
• Built-in Loudspeaker
• Auto Shut Off
• Power standard 9V Battery (included)
• Safety Standards CE Certified, EN ISO 13485:2003 compliant
Technical Data
Principle:
ultrasound, Doppler effect
Acoustic working frequency:
(2.00 ± 0.05) MHz continuous
Doppler frequency:
(290 ± 37) kHz
Overall sensitivity at a distance of
50 mm: (139.0 ± 7.5) dB
75 mm: (136.1 ± 5.2) dB
100 mm: (129.9 ± 10.3) dB
200 mm: (122.4 ± 18.8) dB

Target speed:
(10.7 ± 1.3) m/s
Spatial and temporal peak acoustic pressure:
(17.0 ± 7.1) kPa
Output:
(8.8 ± 4.9) mW
Effective area:
(108 ± 36) mm2
POWER SUPPLY
Battery:
9 V alkaline battery (included)
Estimated service life of battery:
10 hours
 
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