which fetal doppler is best

{"cid":"91221617","title":"Home Fetal Heart Detector Pregnancy Heartbeat Monitor For Mothers And Babies","imgUrl":"https:\/\/img.chinax.com\/nimg\/f1\/a9\/a5ffdc21572470ec6c322c13982c-200x200-1.jpg","attrs":{"Price":"7USD","Brand Name":"HANYUE","Model Number":"JSL-T501","Minimum Order Quantity":"60pcs","Delivery Time":"3-5 Working days","Certification":"CE\/FDA\/ISO13485\/FCC\/RoHs","Place of Origin":"China","Payment Terms":"T\/T, Western Union, MoneyGram","Supply Ability":"100000PCS","Packaging Details":"Each Boxes OPP packing \/12.6 KGS \/ Per carton: 53*29*37cm \/ 60PCS Per Carton.","Warranty":"1 Year","Display":"LCD display","Application":"Hospital\/home use","Weight":"180g","Ultrasonic frequency":"2.5MHz\u00b110%","LCD display":"25*14 mm"}}

{"cid":"91208125","title":"High quality hot selling Ultrasonic Tabletop Doppler Edan SD5 SD6","imgUrl":"https:\/\/img.chinax.com\/nimg\/2a\/b1\/102bd4cc35b0dbbcd4b02631d09f-200x200-1.jpg","attrs":{"Price":"$299.00 - $799.00\/Units","Brand Name":"Edan","Model Number":"SD5,SD6","Minimum Order Quantity":"1pc","Delivery Time":"about 10 days","Place of Origin":"China","Packaging Details":"Export packing","Supply Ability":"1000 Unit\/Units per Week","Certification":"CE,ISO13485","Payment Terms":"T\/T, Western Union,Payoneer","Warranty":"2 years, 3 Years","After-sale Service":"Online technical support","Instrument classification":"Class II","Type":"Doppler Ultrasound Equipment","Application":"GYN\/ob","Product name":"Medical Ultrasound Equipment","Certificate":"approved.","Configuration":"12.1\" LCD monitor","Transducer Connector":"2 standard","Peripheral Ports":"2 USB ports","Dimensions":"20\" L x 17\" W x 16\" H","Port":"guangzhou"}}

{"cid":"91211349","title":"Zoneyee Customizable LOGO black buy blood pressure monitor low temperature digital thermometer best room thermometer","imgUrl":"https:\/\/img.chinax.com\/nimg\/bb\/b6\/86e788b062d2a6c932d612f22484-200x200-1.jpg","attrs":{"Price":"Negotiable by the order quantity","Brand Name":"Zoneyee","Model Number":"GK868A","Minimum Order Quantity":"1000pcs","Delivery Time":"30-45 working days","Certification":"CE,FCC,ROSH","Place of Origin":"China","Payment Terms":"T\/T","Supply Ability":"1.3 million pcs per month","Packaging Details":"Zoneyee Packaging Box or Customzied as your request","OEM\/ODM":"Accepted","Body Mode":"32.0\u00b0C~42.0\u00b0C","Object Mode":"0~100\u2103","Accuracy":"\u00b10.2\u2103","Resolution":"0.1\u2103","Unit":"Celsius (\u2103) \/ Fahrenheit (\u2109)","High Temperature Warning":"YES","Automatic power off":"Yes\/20 Seconds","Measurement distance":"3~5cm","Memories":"32 Groups","Power supply":"2*AAA battery"}}