Do any scales have computer or Bluetooth interfaces?
Certainly….the scales you find in the supermarket checkout lanes have to communicate with the computer. Googling on it, I do find some with a USB interface, which should work for your purposes. I see nothing with a Bluetooth interface.
Unless you have special software, though, I’m not sure you’ll find this convenient to use. How is the computer supposed to know what to do with the information? I’m not sure how the computer will view the scale when attached; barcode scanners are treated like keyboard inputs, and when you click the button, the data read is inserted wherever the cursor is in the active window. It’s possible the scale works the same way, but I don’t know that. Still, I have trouble imagining that it would ever be more efficient than just typing in your numbers (and I’m a computer software developer.)