PCE Instruments PCE-TDS 100HS Information The PCE-TDS 100HS is a portable handheld ultrasonic flow meter or HVACR meter used for non-invasive, unobstructed and highly accurate measurements of the flow velocity of liquids in metal, plastic and rubber pipes and tubes with a diameter of 20 to 108 mm. It is a versatile tool that can be used in a variety of applications, including HVAC, plumbing, and industrial process control. Introduction The PCE-TDS 100HS is a simple to use device that can be operated by anyone with basic technical skills. It features a large, backlit display that makes it easy to read the measurement results, even in low-light conditions. The meter also has a number of other features that make it a valuable tool for professionals, including: