2 channels for voltage and 4 channels for temperature. Type K for thermocouple. 1% accuracy should be fine.How many channels? To what resolution? What do you plan to use as a temperature sensor?
There are dozens of inexpensive starter kits out there like these from Dataq Instruments. A simple Google of "usb based data acquisition system" will bring up a dozen hits. Once you acquire data what do you plan to do with it as in place it on an Excel Spread sheet, write your own software or what? The better the A to D conversion the greater the cost.
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