The EM201SPKIT includes the EM201B, stepped T fittings, magnetic static pressure probes, and pressure tubing. The EM201B provides a simple, time saving alternative to U-tube pressure measurements. Use the EM201B to measure gas supply and draft pressures in residential or light commercial properties. The EM201B also has differential mode which provides a convenient method to measure pressure drops. The EM201SPKIT is backed by a 3-Year limited warranty.