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The ultrasonic fetal doppler meets the fetus daily check and routine examination at home, clinic, community, and hospital. Multiple probe options are available including 2MHz, 2.5MHz, or 3MHz to suit different requirements.
| Functions | FD-610D | FD-610C | FD-610B | FD-610G |
| Doppler type | Continuous | Continuous | Continuous | Continuous |
| Display | B/W | Colour | B/W | Colour |
| FHR curve | No | Yes | No | Yes |
| Build-in speaker | Yes | Yes | Yes | Yes |
| Battery Type | Ni-Mh | Ni-Mh | Alkalinity | Alkalinity |