UNI-T UT366A Digital Manometer vs U-Tube Manometer Malaysia

A digital manometer and a traditional U-tube manometer can both measure pressure difference. However, their portability, reading method, supported units and suitability for field work are different.

The UNI-T UT366A is a portable electronic manometer designed for gauge-pressure and differential-pressure measurement. A U-tube manometer uses the movement of liquid inside a transparent tube to indicate pressure.

The right choice depends on whether the user needs a simple fixed reference or a portable instrument for regular HVAC and industrial maintenance.

How a U-Tube Manometer Works

A U-tube manometer contains liquid inside a U-shaped transparent tube.

When pressure is applied:

One liquid column rises
The other liquid column falls
The height difference represents the applied pressure

The user must read the liquid level against the printed scale.

Its main advantages are its simple principle, lack of electronic components and suitability as a basic visual pressure indicator.

How the UNI-T UT366A Works

The UT366A uses an internal pressure sensor to convert the applied pressure into a digital reading.

It provides:

Gauge-pressure measurement
Differential-pressure measurement
Independent P1 and P2 readings
Positive and negative pressure indication
Multiple selectable units
MAX, MIN, AVG and HOLD functions
Optional air-velocity measurement with a Pitot tube

The reading is shown directly on its backlit digital display.

Main Comparison

Feature	UNI-T UT366A	U-Tube Manometer
Reading method	Digital display	Liquid-column scale
Portability	Compact handheld instrument	Depends on tube size and mounting
Differential pressure	Yes	Yes
Positive and negative pressure	Yes	Depends on setup and scale
Multiple pressure units	Selectable	Usually fixed scale
MAX, MIN, AVG and HOLD	Available	Not available
Low-light reading	Backlit display	External lighting may be required
Liquid required	No	Yes
Spill risk	No measuring liquid	Possible
Pitot tube airflow mode	Optional	Requires manual calculation and suitable setup
Battery required	Three AAA batteries	Normally no battery

Reading Convenience

The UT366A provides a numerical value directly on the display. This reduces the need to estimate a liquid level between scale markings.

A U-tube manometer requires the user to:

View the liquid at the correct angle
Avoid parallax error
Read both liquid levels correctly
Confirm the selected scale
Check the liquid density and condition
Ensure the tube is installed vertically

The digital display is generally more convenient for technicians moving between multiple service locations.

Portability

The UT366A measures approximately 53 × 30 × 137.8 mm and is supplied with a carrying bag and magnetic hook.

It is suitable for technicians who need to inspect:

Several AHUs
Multiple filters
Different fan systems
Separate rooms
Factory ventilation systems
Data-centre cooling systems

A fixed U-tube manometer may be more suitable for permanent monitoring at one machine or filter bank.

Pressure Units

The UT366A supports several units, including:

kPa
mbar
bar
psi
mmHg
inH₂O
inHg
mmH₂O
ftH₂O
hPa

This is useful when different equipment manuals use different units.

A U-tube manometer usually has a fixed printed scale. Manual conversion may be required when the required unit is different.

Maintenance Requirements

The UT366A requires:

Battery inspection
Hose inspection
Pressure-port protection
Periodic performance verification
Calibration when required by the user’s quality system

A U-tube manometer requires:

Liquid-level inspection
Leak inspection
Correct fluid quantity
Clean transparent tubing
Vertical alignment
Scale and zero verification
Protection against evaporation, contamination and spills

Both instruments can produce incorrect results when the hoses leak or pressure points are connected incorrectly.

Field Troubleshooting

The UT366A provides useful functions for field work.

HOLD retains the displayed value when the screen is difficult to view.

MAX and MIN help identify the highest and lowest values during a test.

AVG can provide an average value when pressure varies slightly.

Positive and negative pressure LEDs also help technicians recognise the pressure direction.

A U-tube manometer shows pressure changes visually, but the technician must manually observe and record the liquid movement.

Airflow Measurement

When paired with an optional Pitot tube, the UT366A can measure air velocity inside a duct.

This allows the same instrument to support:

Duct-pressure measurement
Filter pressure-drop checks
Fan-pressure comparison
Duct air-velocity testing

A U-tube manometer can measure the pressure generated by a Pitot tube, but air velocity normally needs to be calculated separately using the correct formula and air-density assumptions.

When to Choose the UT366A

Choose the UNI-T UT366A when you need:

A portable instrument
Fast digital readings
Multiple pressure units
Positive and negative pressure indication
MAX, MIN, AVG and HOLD functions
Pressure checks at multiple locations
Optional Pitot tube air-velocity measurement
A compact instrument for HVAC service work

It is particularly useful for contractors and facility teams carrying out regular inspections.

When to Choose a U-Tube Manometer

A U-tube manometer may be suitable when:

A simple pressure indication is required
The unit will remain at one fixed location
Battery-free operation is preferred
The operator can correctly read and maintain the liquid column
Digital recording functions are not required

The installation must remain level and protected from vibration, contamination and fluid loss.

Which One Is Better?

Neither method is automatically better for every application.

The UT366A is generally more convenient for portable troubleshooting and maintenance, while a U-tube manometer can remain useful as a simple fixed pressure reference.

Before selecting an instrument, confirm:

Expected pressure range
Required accuracy
Measurement location
Pressure unit
Portability requirement
Recording functions
Calibration requirements
Whether duct air velocity must also be measured

Digital Manometer Selection in Malaysia

For help choosing between the UNI-T UT366A Digital Manometer, a Pitot tube setup or another HVAC test instrument, contact MTM Precision with your application and expected pressure range.

MTM Precision Sdn Bhd

Showroom & Service Centre:
No. 29-1 & 29-2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia

Tel: 03-8080 7172
WhatsApp: +6016-660 7346
Email: mtmpre@yahoo.com
Website: www.mtmpre.com.my