Well, I purchased the milk scale. I emailed the sellers and they tested the scale with some weights for me. I am not planning to use it commercially or anything, but I read that you should track your goats' production as a way of monitoring their health, so I wanted some some degree of accuracy.
I just love the thought of hanging this old brass scale in my goat barn! Total cost was $9.99 US and $6.99 for shipping. That's a bargain, especially with the Canadian dollar so strong right now.