UEI Test Instruments
Hi-Res Differential Manometer
The EM201B is a dual-input digital manometer for gas supply, draft pressure, static pressure and pressure-drop checks in residential and light commercial HVAC work.
Technical snapshot
Key EM201B pressure specs.
The numbers that matter for low-pressure HVAC and gas diagnostics: range, resolution, accuracy, selectable units and field operating limits.Pressure diagnostics
Compare two pressure points without going back to a U-tube.
The EM201B gives technicians a simple digital way to measure positive pressure, negative pressure and differential pressure. With two pressure ports, selectable scales and a high-resolution display, it is made for practical HVAC, gas service and appliance testing.
- Measure gas supply and draft pressures in residential or light commercial systems.
- Use the positive input for single-point pressure measurement.
- Use both inputs to compare two points and measure pressure drops.
- Scroll between In-WG, mBar, PSI and Pa, with Pa auto-ranging to hPa above 1000 Pa.
- Zero before testing, then use Hold and Dynamic Min/Max when readings need to be captured.
- Use the magnetic mount to keep the meter visible while both hands are on the test setup.
What it helps check
Use the EM201B where low-pressure readings directly affect commissioning, safety checks and fault finding. The dual-input layout is especially useful when the pressure difference is more important than either single reading.
- Gas supply, manifold and appliance pressure checks.
- Draft pressure and combustion appliance diagnostics.
- Pressure drops across filters, coils, heat exchangers, supply and return points.
EM201B field guide
Pressure testing, minus the fiddly guesswork.
Where it earns its keep
Use it when a small pressure difference tells the bigger story.
- Commissioning gas equipment where supply or manifold pressure must match the equipment specification.
- Checking pressure switches and draft conditions where repeatable low-pressure readings matter.
- Finding restrictions by comparing pressure before and after a filter, coil, heat exchanger or duct section.
- Swapping from a U-tube workflow to a faster digital reading with Hold, Min/Max and selectable units.
Setup rhythm
Zero, connect, then compare.
Zero the meter in a non-pressurised area before testing. For single input readings, connect to the positive port. For differential testing, place the positive port at the expected higher pressure and the negative port at the expected lower pressure.
Gas & pressure safety
Keep the tubing clear and stay inside the rating.
- Check the meter and tubing for breaks or blockages before use.
- If gas is suspected or smelt, close the gas supply and ventilate the occupied space.
- Do not use it for water pressure and do not exceed the 10 PSI input pressure limit.
Related test instruments
Linked Kane & UEI products from Omni Tools.
Internal Omni Tools links only — related pressure, HVAC/R and field diagnostic instruments.Useful information & documents
EM201B resources.
Omni Tools product and range links, plus official UEI documentation for setup, operation and detailed specifications.Omni Tools links
Manufacturer documents
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