PosiTest® AIR

Quickly and easily detect air and water leaks in building envelopes and rigid air barrier systems. Ideal for testing penetrations (fasteners, masonry ties, etc.) and continuity of joints and seams in rigid air barrier systems.

For use with...

  • Single and two-ply membranes
  • Liquid applied membranes
  • Sprayed Polyurethane Foam (SPF)
  • Boardstock
  • Metal Liners
  • Exterior Insulation and Finish Systems (EIFS)
  • EPDM roofing systems
  • Waterproofing and more
Made in USA flag with black text below
Conforms to ASTM E1186


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  • Each kit comes with everything needed for testing
  • Includes FREE downloadable PosiSoft Desktop Software for PC
  • One year warranty
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  • Internal memory stores up to 200 test results with rate, time duration, limit and user-entered Pass/Fail conclusion
  • High accuracy pressure sensor
  • Conforms to National Standards including ASTM E1186
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  • Portable, lightweight tester can be used in any position
  • Environmentally sealed enclosure—dustproof and waterproof
  • Built-in rechargeable batteries perform up to 200 tests per charge. Continue testing with AC power while batteries recharge. Supplied with universal AC adapter.
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Pressure Differential Range
100 – 900 Pa
Rate of Depressurization
5 – 30 Pa/Sec
Test Chamber Size
Ø16" (40 cm) Base
1 Pa
± (10% + 10 Pa)
Carry Case Dimension
38 cm (15") x 48.3 cm Ø (19")
3.8 kg / 8.5 lbs.
Shipping Weight
6.7 kg / 14.7 lbs.
PosiTest AIR comes complete with kit

Tester comes complete with shoulder strap, high impact polycarbonate test chamber, durable 5' (1.5 m) hose with quick disconnect couplings, built-in rechargeable NiMH batteries with charger (AC power supply), 8 oz. test solution with dauber (Qty. 4), instruction manual, USB cable, PosiSoft Desktop Software (available as a free download), Certificate of Calibration traceable to NIST, one (1) year warranty and soft-sided nylon carry case.

How It Works

Detailed instructions are available in our PosiTest AIR Instruction Manual

The portable, hand-operated PosiTest AIR Leak Tester tests the air barrier integrity of single, two-ply and liquid membrane systems, including air barriers, roofing systems, waterproofing and ground liners by locating leaks.

In accordance with ASTM E1186, the PosiTest AIR will indicate whether leaks exist in the test area. It is a simple Pass/Fail test.


Apply the PosiTest AIR Test Solution to the test area

Photo montage showing how to apply PosiTest AIR Test Solution


Place clear Test Chamber over the test area

Photo displaying the PosiTest AIR chamber over the test area


Initiate the test (depressurize the chamber)

Photo displaying the PosiTest AIR depressurizing the test chamber


Store Test Result (optional)

The PosiTest AIR's internal memory can store up to 200 test results which can be transferred to a PC using PosiSoft Desktop Software. Test results include rate of depressurization, pressure differential limit, time duration and user-entered PASS/FAIL conclusion.

AIR Tester call out
AIR tester touch screen call out



Do your instruments require any formal training for use? Do you offer ‘demo’ models?

No. Our instruments are designed for simple operation, feature easy-to-use menus, instruction manuals, and helpful videos. In lieu of demonstration models, we provide unlimited technical support via telephone and/or email, and a limited 30-day money back guarantee.


Does the PosiTest AIR include a certificate of calibration?

The PosiTest AIR arrives fully calibrated and ready to measure. A long-form Certificate of Calibration showing traceability to a national standard is included at no additional expense. For organizations with re-certification requirements, the PosiTest AIR may be returned at regular intervals for calibration. DeFelsko recommends that our customers establish their instrument calibration intervals based upon their own experience and work environment. Based on our product knowledge, data and customer feedback, a one year calibration interval from either the date of calibration, date of purchase, or date of receipt is a typical starting point.


Does the PosiTest AIR include fixtures for testing corners or angled surfaces?

The PosiTest AIR includes a dome test chamber. No other test chamber configurations are available from DeFelsko.


Can dish soap be used instead of the included solution?

DeFelsko recommends the use of PosiTest AIR Test Solution only. Dish soap and other common soapy liquids don't have the necessary viscosity and formulation to reliably create visible bubbles when encountering the types of air leaks that the instrument is designed to detect. Using such non-specific liquids may result in building envelope air leaks being missed. They also don't comply with the ASTM E1186 standard as they will form bubbles when applied to the area being measured.

Extensive research and development went into the formulation of our PosiTest AIR Solution. This proprietary high viscosity formulation ensures...

  • air bubbles properly form and are visible when an air leak is present – leaks don't get missed!
  • air bubbles don't form when solution is applied to test area (in compliance with ASTM E1186)
  • optimal results when measuring on vertical surfaces – test solution doesn't flow away from the test area
  • proper test solution performance in cold environments down to -10° C/14° F (low temperature solutions available for measuring down to -20° C/-4° F

Can the solution included with the PosiTest AIR be used at low temperatures?

The included solution is suitable for use in temperatures ranging from -10° C to 65° C. Low temperature fluid is available as an accessory item and is suitable for use between -20°C and 65°C.


What is the shelf life of the solution included with the PosiTest AIR?

Based upon our observations, the test solution is completely shelf-stable and will not lose efficacy over time.


Still need help?

Before returning your gage or instrument for service, review the troubleshooting steps on the Troubleshooting guide, or speak with a member of our technical support team by calling +1-315-393-4450.


PosiTest AIR Test SolutionPosiTest AIR Test Solution

Every PosiTest AIR comes complete with (4) bottles of Test Solution. Additional bottles are available in cases of (16) 8 oz. bottles.

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