Best fetal dopplers?

Nia • Currently have an almost 2 year old, and newborn and 3 angel babies ❤❤❤💗💗
Hey ladies, what brand fetal dopplers do you recommend? At how many weeks can you hear baby's heartbeat? Do you recommend getting one if you've had one before? I've had 2 miscarriages and could use some reassurance sometimes...