I use this scale. It is delicate enough to measure 0.1g which makes it good for IAF testing and can support 5kg of weight which is good for handling the weight of the tablet.
This specific cable works to connect the serial port on the scale to a USB port on the PC
CableCreation USB to RS232 Adapter with PL2303 Chipset (amazon link)
Tablet expert Kuuube, has provided some sample code to read the data from the scale into a PC using Python. See the github project here: us_solid_scale_reader