This the most advanced PUF sampler on the market. It utilizes a microprocessor-based controller for instantaneous and accurate flow control. The systems built in temperature and barometric pressure sensors along with the microprocessor based flow controller that allows the system to accurately calculate the flow rate. The flow controllers include built in digital timer with internal backup, multiple elapsed time indicators, and four data logs an external USB drive for data retrieval. The system data logs record the average minimum and maximum ambient temperature and barometric pressure as well as the total ambient and standard flow rate. The flow controllers also include an auto calibration feature, which eliminates the need for lengthy field calibration and manual flow rate calculations.