Model 6710 is the perfect tool for accurate supply and return airflow measurements. Interchangeable hoods make it a snap to sample the air for any duct size. The unit is lightweight and easy to handle. The full color screen can be tilted so it's atthe optimal viewing angle at any height. Model 6715 includes, in addition, a removable handheld micromanometer (6700) with Bluetooth® wireless capability. This can be uses with pitot tubes and a Velocity Grid to measure air velocity.