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Manometer with Both Positive and Negative Pressure Display

-2,000 to 2,000 mbar, Differential, Gauge


Item# HHP91

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-9 $361.44
10-24 $343.37
25-49 $336.14
50-99 $321.68
100+ $314.45

In stock

Lead Time (If not in stock): 14 weeks
-2,000 to 2,000 mbar, Differential, Gauge HHP91 HHP91
  • Eight User-Selectable Units: psi, mbar, kg/cm2, mmHg, inHg, mH2O, inH2O, atm
  • Measures Up to ±2000 mbar (±29 psi)
  • Auto Shut-Off Function Prolongs Battery Life
  • Built-In Tilt Stand

HHP91 Model Options

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Edit these specs to order a different model. Not all combinations are valid. Options compatible with previous selections will be in bold.

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Pressure Type
Accuracy Class
Accuracy Value
Number Of Digits

  • Battery Size 9V
  • Batteries Included Yes
  • Battery Type Alkaline
  • Display Digit Height 15 mm
  • Maximum Ambient Humidity <80% RH (non-condensing)
  • Maximum Ambient Temperature 50 {C} (122 {F})
  • Measurement Mode Auto off (after approx. 20 min)
  • Measurement Type Pressure
  • Number of Batteries 1
  • Power Source Battery
  • Pressure Units psi
  • Sample Rate Approximately 0.8 seconds
Model HHP91 is a precision manometer for automotive, HVAC, laboratories, and general industrial applications. The unit comes complete with a built-in sensor with dual inputs for gage or differential measurements. It is compatible with air or non-corrosive and non-ionized gases and liquids. Either port measures the full range. P1 is positive with increasing pressure, P2 is negative with increasing pressure. Eight selectable pressure ranges make this instrument compatible with all measuring systems. The readings are easy to read, displayed in large 15 mm (0.6") high digits.

psi, mbar, kg/cm2, mmHg, inHg, mH2O, inH2O, atm
Functions: Auto off (after approx. 20 min), reading hold, min and max
Accuracy: 2% FS, 23 ±5ºC, includes linearity, repeatability and hysteresis
Operating Temperature: 0 to 50ºC (32 to 122ºF)
Operating Humidity: <80% RH (non-condensing)
Power: 9V alkaline battery (included)
Sampling Time: Approximately 0.8 seconds
Pressure Ports: Quick disconnect for 3 to 4 mm ID tubing
Meter Dimensions: 185 H x 78 W 38 mm D (7.2 x 3.0 x 1.4")
Meter Weight: 345 g (0.8 lb)
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Rated 2 out of 5 by from Director of UG Transmission I Bought this unit and had it shipped overnight delivery for a emergency project and the unit had no battery with it. Not sure if it was even calibrated!
Date published: 2018-09-11
Rated 5 out of 5 by from HHP - Awesome I bought this part for my engineering group and it is great. The price was right and the delivery was perfect.
Date published: 2017-07-10
Rated 5 out of 5 by from Just what i needed did the work; accuracy more than adequate and great features.
Date published: 2016-01-28
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Hi would this or another unit come with an nist certificate.

Asked by: Gilly8830
Thank you for your inquiry. This unit doesn't come with a N.I.S.T. cert. Please contact the pressure group to discuss options. There are a few and would need to discuss your application in detail.
Answered by: application engineer je
Date published: 2020-09-21

Dear sir/madam, I am looking for a differential pressure meter that comes with software, so I can store the data on a computer and view it in real-time. We need the meter for scientific purposes. Price doesn't matter. Can you help me?

Asked by: Jobo
We suggest you look at our HHP8200 Series manometer. These units are available with RS232 output and software
Answered by: Applicatrions Engineer JK
Date published: 2020-03-25

Can distilled water or sterile water be used on this manometer.

Asked by: Edward1
We recommend using deionized (DI) water with manometer.
Answered by: Applicatrions Engineer JK
Date published: 2023-06-21

Can these units be calibrated?

Asked by: FrankieG
You can perform a calibration verification on the HHP91, however there are no adjustments that can be made to the unit.
Answered by: rkent
Date published: 2021-08-19

What type and size tubing (OD and ID) is used for the fittings on this unit?

Asked by: Sprinkles
Thank you for your inquiry, The HHP91 comes with (2) quick-disconnect tube fittings for 3 to 4 mm ID tubing
Answered by: rkent
Date published: 2021-12-02
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