I'm looking for a cheap USB peripheral that I can use to collect voltage measurement data. The application that I currently have in mind is to measure battery capacity by attaching a known resistance and then integrating the voltage measurements. This is purely for fun and out of interest.
I would prefer a peripheral that I can access through a USB API like pyUSB. Preferably not something that requires the use of the manufacturer's software/drivers linked to a specific platform; I want to be able to use this on Linux.