I got an AD7730 IC (load cell analog to digital converter) and connected to an Arduino microcontroller and a load cell. The AD7730 chip is only on a solderless breadboard right now, but I'm getting pretty good results. The load cell I'm using is rated for 30Kg's and I'm able to read 1/10th of a gram with some noise & drift. So far my microcontroller code just configures the AD7730 chip, reads raw values and converts them to units by responding to computer keys for zero and calibration.
I'm wanting to get this thing all together in a handheld enclosure with rechargeable batteries, a LCD display and buttons to allow setup, configuration, and calibration. A connector will allow me to change load cells so I can use this with a reloading scale or a 10 ton crane scale, with all the configuration and calibration saved for each load cell I want to use it for, saving data for a dozen load cells shouldn't be a problem.
Just thought I'd share this in case anyone wants to mess with Arduino scales and the AD7730 chip, I can paste my Arduino code that will help get you started. I couldn't find any functional code with my searches so I started with a program that wasn't working and got it going with major modifications.
RogerN