DM2 - Digital Manometer [Refurbished]

The DM2 is no longer for sale. For current options, CLICK HERE

Retrotec continues to provide calibration and repair services for the DM2. For calibration or repair, CLICK HERE

Out of stock

Retrotec's DM2

The DM2 is no longer for sale. For current options, CLICK HERE

The DM-2 is a two channel digital micro-manometer, or differential pressure gauge. It combines simple but comprehensive functionality, with intuitive controls and setup.

The DM-2 is a digital gauge that always displays the pressure on Channel A, but can display pressure measurements, calculated air flow, air changes per hour (ACH), or equivalent leakage area (EqLA) on Channel B depending on the Mode selected. The Digital Gauge Package provides all the nice to have items a first time tester will need with the DM-2.

The DM-2 can also present the measured results in a number of different units, which meet the professional standards of many different countries and testing protocols. To ensure accurate results, the DM-2 takes up to four pressure readings per second on each channel, and updates the information displayed on the screen every second.

Retrotec’s DM-2 puts the operator in command of virtually every parameter of interest to an air leakage tester. It represents a huge advance in building and envelope diagnostic instrumentation, accurately measuring airtightness for duct testing, building air leakage, and clean agent enclosure integrity testing.

Who uses it?

  • Energy Auditors, HVAC Contractors, Building Contractors & Remodelers, Home Inspectors

Specifications for Digital Gauge Model:


Gauge dimensions:

8.8" × 4.3" × 3.0" (22.2 × 10.8 × 7.6 cm)


14 oz (397 g)


A/C (country specific plug and voltage options) or (4) AA Batteries.

Screen type:

Monochrome non-touchscreen LCD display

Screen dimensions:

2.7” (6.8 cm) diagonal, 2.4" × 1.3" (6.0 × 3.3 cm)


8 bit

Pressure channels:

2 independent pressure channels (“A” & “B”)

Pressure sensor type:


Pressure range:

-1250 Pa to +1250 Pa (-5 to +5 in WC)

Pressure resolution:

0.1 Pa (0.0004 in WC, 0.002  psf)

Pressure accuracy:

±1% of pressure reading or ±0.15 Pa (whichever is greater)

Pressure accuracy calibration meets:

USACE, ASTM E779-10, CGSB-149.10, EN 13829,UK ATTMA TSL1 and TSL2, NFPA 2001, ISO 14520, EN15004

Operating temperature:

-40 to 130°F (0 to 53 C)

PC Connectivity options:


Recommended calibration interval:

Every 2 years

Supported Units of Measurement

Channel A:

Pressure: Pascal, in WC, psf

Channel B:

Pressure: Pascal, in WC, psf

Flow:  CFM, L/s, m3/s, m3/h

Flow per Area (Permeability):  CFM/sq ft, CFM/100 sq ft, CFM/1000sq ft, (m3/h)/m2, (L/s)/m2

Air changes per hour:  /h

Equivalent leakage area,  “EqLA”: sq ft, sq in, cm2

Equivalent leakage area per enclosure area, “EqLA per Area”:  cm2/m2, sq in/100 sq ft,

Effective leakage area,  “EfLA”: sq ft, sq in, cm2

Effective leakage area per enclosure area,  “EfLA per Area”: sq in/sq in, sq in/100sq ft, cm2/m2

*Results can be extrapolated to any desired test pressure


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