How to take readings to a precision scale

I want to pull usable data from a precision scale and record weights on my arduino. Is there anyway to integrate into a digital scale and do that. The idea is to be able to weigh something, have the arduino record it and save it on an SD card. If anyone has links to scales I can integrate into please leave the link.

What do you intend to weigh? a fly or an elephant?
You can buy industrial scales with a digital output (for megabucks)
You need to give a LOT more information if you expect a useful answer.