The EM201BSPKIT provides the equipment needed to measure gas supply and draft pressures in residential or light commercial properties. The EM201B differential mode provides a convenient method to measure pressure drops with added accessories for professionals. From the Manufacturer UEi Test Instruments has over 50 yearsrsquo; experience designing and manufacturing a broad range of award-winning, industry-leading Test and Measurement Tools. Professionals recognize the UEi brand for quality and innovative features designed to solve real-world problems. UEi backs its products with dedicated technical support, service and repair teams.