The figure above shows the basic set up of the experiment. We use Lithium Thionyl Chloride Batteries (12.4V, 35 Ah) to power the barometer (Vaisala, PTB210 Series), a temperature sensor (Honeywell RTD, Platinium probe) and a humidity sensor (Honeywell HIH 3605). Data is stored by via a data logger (Tattletale 8v2).