Portable Digital Manometer (Dual LCD)

This Portable Digital Manometer (Dual LCD) measures positive, negative and differential pressure and display directly the measured values and signals in the dual LCD.




GAOTek Portable Digital Manometer (Dual LCD) measures positive, negative and differential pressure and display directly the measured values and signals in the dual LCD. It has 11 selectable measuring units as H2O, psi, bar, mbar, kPa, inHg, mmHg, ozin, fitH2O and kgcm. This manometer is equipped with a simple hose connection easy to operate and accurate in measurements. The maximum pressure is up to 10 PSI with built-in low range and high range error indicator. It is an indispensable testing tool for HVAC technician, maintenance engineers and science researchers. It is easy in operation and clear reading.

Key Features

  • 11 selectable units of Measure
  • Max/min/average, and with a relative time
  • 9 selectable English and metric engineering units
  • Large, easy to read with backlight display screen for use in dark areas
  • Zeroing, offset and data compensation
  • Low-battery display and automatic shutdown
  • Data hold and error code

Technical Specifications

Display Dual LCD
Accuracy ± 0.3% FSO 77 °F (25℃)
Repeatability ± 0.2 % (Max +/- 0.5 % FSO)
Linearity / Hysteresis ± 0.29 % FSO
Maximum Pressure 10 psi
Response Time 0.55 seconds typical
Low Battery indicator Yes
Over Range Indicator Err.1
Under Range Indicator Err.2
Power Supply 1 x 9 V Battery (included) or External 9 V DC
Dimension 6.69 in x 2.17 in x 1.3 in (170 mm x 55 mm x 33 mm)
Weight 5.82 oz. (165 g)
Operating Temperature 32 °F to 122 °F (0 °C to 50 °C)
Storage Temperature 14 °F to 140 °F (-1 °C to 60 °C)

Functional Specification

Function Range Resolution
InH2O ± 2078 1
Psi ± 75.00 0.01
Mbar ± 5168 1
kPa ± 517.7 0.1
inHg ± 15.00 0.01
mmHg ± 3878 1
Ozin2 ± 1200 1
ftH2O ± 173.0 0.1
Kgcm2 ± 5.250 0.001
CmH2O ± 5272 1
Bar ± 5.138 0.001

Meter Description:

  1. ON/OFF
  2. HOLD
  3. DIF
  4. Backlight
  5. UNITS+
  6. UNITS-
  7. REC

Display Description

  1. Hold Function
  2. Differential Mode
  3. Primary Data Screen
  4. Record Mode
  6. Low Battery Indicator
  7. Pressure Unit Indicator
  8. Relative Time Clock


Power Buttons:

Press the ON/OFF button to turn power on or off. The meter will perform a short self-test when turned on. The meter defaults to the setting used during the last operation.

Zero Adjust and Offset

Before use and without fittings attached to the meter, press the Hold button for more than 2 seconds to Zero the meter. The meter will raise and display “000” from right to left.  0.000 will be display.

If it is desired to offset the meter and display, press the DIF button while asking a measurement subsequent reading will be the difference between the current measurement and the measurement that was on the display when the DIF button was pressed.

Unit button: Intermittently press the UNITS button there will revolve various units at the bottom of the screen. These units are as follows: bar, mmHg, Ozin2, Kgcm2, psi, inH20, inHg, cmH2O, and mbar

 DIF button: The pressure value when pressing the DIF button subtracting the pressure value before pressing.


Press the HOLD button momentarily to freeze the displayed reading the HOLD icon will appear on the upper left hand side of the display. Press the HOLD button gain to return to normal operation.


The MAX/MIN mode allows the user to view only the highest (MAX), lowest (MIN) or average (AVG) readings with relative time stamp.

  1. Press the Rec button once and Rec appears on the display. The relative time clock also appears in the secondary display and start counting.
  2. Press the Rec button again and Max appears on the display. The Display is now showing the maximum pressure and relative time, it was recorded.


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