Portable Digital Manometer (cmH2O, Bar)

This Portable Digital Manometer (cmH2O, Bar) is designed to measure differential, positive and negative pressure up to the pressure range of 10 psi and water column range of ± 30.6 cm H20.




GAOTek Portable Digital Manometer (cmH2O, Bar) is designed to measure differential, positive and negative pressure up to the pressure range of 10 psi and water column range of ±30.6 cm H20. There is 11 selectable pressure units and is equipped with a simple hose connection device. It is used for testing ventilation and air conditioning system, spot check, clean room, or any gas pressure system troubleshooting. It is an indispensable testing tool for HVAC technician, maintenance engineers and science researchers. It has the low battery indicator which will appear on the LCD.

Key Features

  • 11 selectable pressure units.
  • Max/minimum/average, and with a relative time
  • Large LCD backlight dual display
  • Zeroing, offset, and data compensation
  • Low battery display and automatic shutdown
  • Data Hold and Error code
  • Supports differential mode and record mode

Technical Specifications

Accuracy ± 0.3 % FSO (77 °F (25 °C))
Repeatability ± 0.2 % (Maximum ± 0.5 % FSO)
Maximum Pressure 10 psi
Linearity/Hysteresis ± 0.29 % FSO
Response 0.5 seconds
Display Dual LCD
Positive Overload Indication Err1
Negative Overload Indication Err2
Low Battery Indicator Yes
Power Supply 9 V battery (included) or external 9 V DC
Dimension 2.17 in × 1.3 in × 6.7 in (55 mm × 33 mm  × 170 mm)
Weight 5.82 oz. (165 g)
Storage Temperature 30.2 °F to 140 °F (-1 °C to 60 °C)
Operating Temperature 32 °F to 122 °F (0 °C to 50 °C)

Additional Information

The 11 selectable pressure units are as follows:

Function Range Resolution
InH2O ± 12.04 0.01
Psi ± 0.435 0.001
mbar ± 30.0 0.1
kPa ± 3.000 0.001
inHg ± 0.886 0.001
mmHg ± 22.5 0.1
Ozin2 ± 6.96 0.01
ftH2O ± 1.003 0.001
cmH2O ± 30.6 0.1
Kgcm2 ± 0.030 0.001
Bar ± 0.030 0.001

 Meter Diagram:

The meter has six buttons

  1. Units
  2. DIF
  3. HOLD
  4. ON/OFF
  1. 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


  1. ON/OFF button:

To turn on or off the power

Press the ON /OFF button to turn on the power of manometer. When turned on, the screen will be displayed for about two seconds and then it will display the normal measurement mode.

2. Clearance button:

When turned on, if there is no input differential pressure, instrument will not be clear the values by itself. The values should be cleared manually by pressing the HOLD button for about 5 seconds and the screen will show – it will be cleared later.

3. UNITS button:

Press the UNITS button, it revolves various units at the bottom of the screen. These units are as follows: bar, mmHg, Ozin2, Kgcm2, psi, in H2O, Kpa, ftH2O, inHg, cmH2O, mbar.

4. DIF button:

Differential pressure value is the pressure value when pressing the DIF button and subtracting the pressure value before pressing.

5. HOLD button:

Pressing the HOLD button give the current measurement result. Pressing once more will lift the hold function.

6. REC button:

This button is on the side of the instrument, press this button and it displays the maximum, minimum, average result in process of recording measuring. Meanwhile the other function buttons are locked and cannot operated. Long pressing the REC button for about 5 seconds and it will quit recoding mode.

7. Back light button:

Pressing the backlight button and the backlight will turn on. In dark environment can use this function. Press the backlight button again to turn off the backlight.

8. Automatic power-off function:

It will automatically power off if instrument not work for more than 25 minutes. This can extend the battery life. If do not want to turn off the power, press hold button first, then press the ON/OFF button to start.

LCD will show “ON” to close the function of automatic power-off.

Error Codes

An error message will appear on the display if the meter fails an internal diagnostic test.

  1. Err. 1: Pressure value is over the range.
  2. Err. 2: Pressure value is below the range.

Battery Replacement

When the battery power fails low, “BAT” will appear on the LCD. Replace the 9 V bat


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