The portables line from Panametrics, a Baker Hughes business, offers both ultrasonic liquid and gas clamp-on flow meters: The TransPort PT878GC for gas; and the TransPort PT900 for liquid. These ultrasonic flow meters utilize ultrasound to measure the velocity of a given fluid or gas – also known as “flow” – and are used in a wide variety of fluid and gas applications, from wastewater and various fuels to natural gas and compressed air.