Is the scale in the doctor's office measuring weight in pounds and tenths or pounds and ounces?

I thought it was pounds and tenths, so a weight of xxx.6 would be a little over xxx ½. The assistant in the office today said xxx pounds and six ounces—which would be under half a pound (16 oz. in a lb., so 8 oz. is half a pound).

I have never heard of using decimal notation to record ounces. One ounce and ten ounces would both be .1, so how would you tell them apart? This made no sense to me. After the decimal point, isn’t that tenths of a pound?

I said yes, but the assistant insisted it was ounces. Of course I know you can convert one to the other, but I am asking about the actual reading display on the scale. Was she right?