I have been looking to buy a fetal doppler...again. I have gone through 3 in the last 5 years, buying the cheaper $100 ones. (The sound quality decreases pretty quickly or the thing just breaks for no apparent reason.) So, I am wondering what your favorite fetal doppler is...what would you recommend? I would like to buy a good one this time, for $500 or less. Thanks in advance for any posts that come!