Check the listing for details. UEi Test Instruments EM201B Dual Input Differential Manometer. Condition: New. Listed at 168.48 USD. The EM200, now a EM201B, provides a simple, time-saving alternative to U-tube pressure measurements. Use it to measure gas supply. The differential mode provides a convenient method to measure pressure drops. One year limited warranty.A Digital, Time Saving Alternative to U-Tube Pressure Measurement.EM201B (Dual input) Measures ±60 inches water column .001 wg resolution below 9.999”Ruggedized with sturdy metal fittingsRubber-boot with built-in magnetMeasures in inches water column, mBar, PSI, and Pa (auto range to hPa)Dynamic Min/Max value captureData holdAuto power offBack-lit displayThree year limited warrantySpecification EM201Measurement Range-40" to +40" WG-100 to +100 mBarAccuracy±0.02”WG < 2”WG±1%RDG > 2”WGResolution0.001" -9.999" to +9.999" WG0.01" for < -10" or > +10" WGOperating range32° -104°F (0° - 40°C)10 - 90% RHnon condensingBattery Life40 hours min with alkaline battery