The Zephyr II is specifically designed to provide an excellent quality functionality and performance for very specific purposes. It is also built to meet the needs and standards of the users. Pressure measurement is a very important process for determining the pollutant path ways for IAQ and worker exposure applications. It is also an important HVAC process mainly used in commercial and institutional buildings. Each Zephyr II instrument includes a built-in, auto-zeroing, micro-manometer and 'K'-type thermocouple, static pressures and temperatures. There is also an auto zoning feature which enhances the accuracy differential pressure in a long pitot tube. The Zephyrs is also able to be fitted with a telescoping probe and model 2300 AHTS which are used for humidity, temperature and hot wire air speeds.