The Portaflow-X from Fuji Electric is a portable ultrasonic flow meter utilizing the transit time difference principle for measuring flow rates through pipes from the outside. This liquid flow meter is compact and lightweight, and incorporates the latest breakthroughs in digital signal processing and electronics realizing high performance and easy operation. The most attractive advantage of these portable flow meters is the non-invasive setup, enabling multiple flow measurements of different running systems, and offering a significant cost advantage over time. Some of the most common applications include: backup for an already installed flow meter system, water supply and sewage treatment, flow measurement systems, boiler-water/feed-water supplies, cooling water, cooling oil, and deionized water for semiconductor manufacturing, among others. The meter may be set up with a wide variety of sensors from small diameters to large diameters, over a wide temperature range.