For the last Physics lab we did an experiment involving the the pressure of air at constant volume with varying temperature. In other words, we watched water boil and took pressure measurements at different temperatures. We didn't measure pressure directly, though. We had a special gauge that that changed it's electrical resistance based on pressure.

Due to the jumpiness of the measuring tools, the extrapolated value we got for absolute zero was ~-292° C. The accepted value is -273.15° C.