I have a digital scale that will read out either in grams or in ounces and pounds to the eighth ounce. Maximum capacity is two kilos, or about 4 lbs 5 ozs. It has a tare function, meaning you can place an empty container on the scale and re-zero it, so the container's weight is excluded from the readout. That's handy.

It cost me something like US$20 about 5 years ago and I am pretty sure it was intended as a kitchen scale. I can't recall where I bought it.

And yes, it works fine as a postal scale, too.