Here is the scale I purchased    

3 years ago. It is heavy duty and accurate. I check it out whenever I have a doctors appointment and it is within a pound of the scale they use. It is expensive 78 dollars plus shipping but worth it and you will get a workout just lifting it from under the vanity in the bathroom, it weighs 6 and a half pounds.  Tom

My Weigh SCMXL700T 700 lb 320kg Talking Bathroom Scale

https://www.amazon.com/My-Weigh-SCMXL700T-Talking-Bathroom/dp/B00MQ8A5UY