The HD350 is both a pitot tube anemometer and a differential manometer. Differential pressure is measured in 5 units of measurement, and the kit contains a Pitot tube and two connecting hoses for monitoring air velocity/flow. Additional features include data hold, auto power off, zero function, and the ability to manually record and recall up to 99 readings. Built-in USB port. Complete with software and USB cord, a 9V battery, and two 33.5-inch pitot tubes. (85 cm) connecting hoses and a sturdy carrying box.