I'm looking for a device I can use to measure analog voltage (up to 25V) and send the data to a PC via USB. Only really need one input, though it wouldn't hurt to have more. My main concern is that it needs to be pretty small and light - any ideas? The few I've seen online are either too bulky or too costly. It would also be nice to have some sort of software platform to display the data as well.. Thanks for the input!