Where the PFT experts come together

EasyOne® Air

Portable & PC spirometer

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EasyOne Air is a flexible, accurate and proven spirometry solution designed for healthcare providers large and small. Utilizing TrueFlow™ technology, this portable spirometer delivers reliable results without the need for calibration to ensure lifetime worry-free operation. Thanks to the vivid color touch screen, it is easy to navigate, view real-time results and enter data.

  • Flexible Use, Consistent Results

    EasyOne Air can be used as a portable or as a PC spirometer. It delivers consistent results in various conditions and settings.

  • Calibration-free TrueFlow™ Technology

    Utilizing high-quality components and Swiss precision-engineering, TrueFlow™ delivers robust and reliable testing results without needing calibration.

  • Color Touch Screen

    View real-time graphs, quickly enter patient data and easily navigate with the high resolution color touch screen in the EasyOne Air.

  • Bluetooth and EMR Connectivity

    Easily connect to PC for real-time patient incentives, data exchange and EMR connectivity.

Details EasyOne® Air

Ready to Take on Any Challenge

EasyOne Air can be trusted in various locations and environments to perform reliably.

  • Reliable design tried and tested at large screening events
  • Extremely robust TrueFlow™ measurement technology
  • Performs up to 100 complete tests with one battery charge
  • Proven completely calibration-free device

Choose Between Portable Mode and PC Mode

Use EasyOne Air in portable mode, where the data is stored and the graph is displayed directly on the device, or use it in PC mode for more options.

  • Portable or PC mode
  • Stable Bluetooth connection
  • Real-time curve display
  • Real-time data transfer
Portable and PC spirometer

Connectivity to Printers, PCs and EMR

Easily integrate EasyOne Air into your existing clinical workflow. The device is equipped with Bluetooth and USB modules making connections to printers, a central database and EMR systems extremely easy and stable.

  • Directly connect printers via USB or print via EasyOne Connect
  • Synchronize data via USB or Bluetooth
  • Integrate into all major EMR/EHR systems via HL7, XML, GDT, or API
  • Reference projects to all major EMR systems available on request
Easyone spirometer and connectivity

Powered by EasyOne Connect - ndd's Integrated Software Platform

Start using EasyOne Air in combination with EasyOne Connect software for central data review and handling, as well as access to more advanced PFT software functionality. Features include:

  • Powerful commenter functionality
  • Encouraging pediatric incentives
  • Custom provocation protocols
  • Import external PFT data

For more information, please visit the EasyOne Connect product page.

EasyOne Connect software

Powerful EMR EHR Integration Engine

EasyOne Connect software includes powerful EMR EHR interoperability and IT management functionality for streamlined workflows. Features include:

  • Proven EMR integrations
  • Supports integration standards - HL7, XML, API, GDT, etc.
  • Active directory integration
  • SQL Server database

For more information, please visit the EMR EHR interoperability solutions page.

EasyOne Connect EMR EHR capabilities

Direct Print Solution

EasyOne Air offers the unique option to print out test results directly without the need of a PC. A large variety of printers is supported and can be used without further installation. This makes the EasyOne Air one of the most mobile spirometry devices on the market.

  • Print from a PC through EasyOne Connect or connect your printer directly via USB cable
  • You can use EasyOne Air with both thermal printers and printers for ordinary paper
  • Printers must support at least one of the following printer languages / formats: Direct PDF, Postscript, HP PCL 3 Enhanced protocol or HP PCL3GUI (Firmware ≥ V1.10.0)

Please check out the application note about printing with EasyOne Air.

EasyOne spirometer printer capabilities

Customized Reports

Customize reports and chose the parameters to be displayed.

  • Choose graphs to be displayed
  • Color reports for better visibility
  • Arrange graphs and parameters through EasyOne Connect
  • Choose between Z-score, % predicted and LLN through EasyOne Connect

QC-Grading and Result Interpretation

Get automatic quality grading and interpretation based on NLHEP and ATS/ERS with the EasyOne Air.

  • Quality grades based on NLHEP and ATS/ERS 2005 and 2019 for all tests
  • ATS/ERS interpretation
  • GOLD/Hardie, NICE, JRS and NLHEP

Cyber Security Protection for IT and Patient Information

Protect your patient information. EasyOne Air is a modern system designed to fulfill your cyber security needs.

  • Encrypted database
  • User authentication with automatic log off
  • User permission levels
  • FDA Approval in 2017 with cyber security documentation

Worldwide Compliance with Standards

Stay compliant with ATS/ERS standards and specific country regulations.

  • Fully conformant to ATS/ERS 2005 and 2019 and ISO standards
  • Worldwide approvals
  • CE Approval
  • FDA Approval

Click here for a complete list of ndd certificates.

TrueFlow™ - Trusted Ultrasound Technology

Stop worrying about calibration or accuracy of flow measurements. TrueFlow™ is the only ultrasound technology proven to be accurate for a lifetime for flow and volume measurements.

To review case studies and additional information about our proven technology, please click here.

EasyOne connect icon

Large Selection of Predicted Sets (%Pred, Z-score and LLN)

The first in line for newly published predicted values: EasyOne® devices are used in predicted studies worldwide (e.g. LUNOKID, ALAT).

  • %Pred, Z-score, LLN
  • GLI (Stanojevic 2009, Quanjer 2012)
  • NHANES III (North America)
  • PLATINO (South America)
  • ERS (Europe) and JRS, IP, Chhabra (Asia)

Please see our specifications below for a complete list of the supported predicted values.

Infection Control

The EasyOne Filter solutions provide additional protection for those who wish to include a filter when performing tests.

  • The EasyOne Filter keeps the ambient environment clean for technicians and patients.
  • The ndd breathing mouthpiece protects the flow sensor from contamination.
  • Fully passes 13 Waveform test as required by the 2019 ATS/ERS standard.
  • Available for most testing environments where filters are required.

Avoid cross-contamination and keep cleaning to an absolute minimum:

  • All parts exposed to the patient's breath are single-patient-use.
  • The sensor is protected from contamination by the ndd breathing mouthpiece.
  • Only simple surface cleaning is required for the ndd device.
  • No special storage conditions are required for single-patient use Spirettesand FlowTubes (ndd breathing mouthpieces).

Visit our Infection Control page for more information.

EasyOne Filter design allows for lung function testing accuracy and infection control. Fully passes ISO 13 waveform testing required by ATS/ERS (pictured above). 

Software releases EasyOne® Air

EasyOne Connect V03.09.05.19

Release date: 2024-04-18

EasyOne Air Firmware V1.19.0

Release date: 2024-04-18
Application Notes
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FAQs EasyOne® Air

ndd can integrate with any EHR vendor that can support a bi-directional HL7 orders/results lab interface. 

ndd offers a file-based integration utilizing an SFTP or network-based location for file communication with an EHR vendor. HL7 is the standard data structure that ndd utilizes but can support other data formats as well. The use of other interface engines can be utilized to complete an integration project.

Duration depends on the IT team of the facility. The ndd side of the integration process can be completed within a few hours for standard integrations. EasyOne Connect software is simply configured to point to the SFTP or network-based location where files are being placed.

EasyOne Connect software utilizes AES 256 encryption. SFTP has its own security protocols built into it. If a network-based location is utilized, it will follow the protocols of the facility.

Yes, EasyOne Connect offers an optional centralized patient database feature, enabling seamless access to patient orders and results across all instances of the software, irrespective of physical location. Customers can leverage their on-premise SQL servers or MS Azure environments to ensure data accessibility and consistency. 

EasyOne Connect provides flexible options for managing users and their access. User accounts can be created and managed directly within EasyOne Connect for simple permission control. For more advanced management, the software supports integration with Active Directory for using your existing directory service accounts, groups, and permissions. EasyOne Connect also supports optional single sign-on (SSO) capability through integration with major identity providers. Please see application note for additional information. 

ndd has integrated with all major vendors and can provide examples of successful integrations with various healthcare providers and organizations. You can contact our integration department via email at [email protected] for more information.

ndd does not handle the maintenance and upgrades as the software is installed locally on the client’s machine. We do, however, offer a silent installer package that our support team can assist you with. This silent installer can be executed via a script through active directory commands depending on your facility. It is the responsibility of the facility to implement any future updates. There is no licensing fee associated with the software and/or the updates.

ndd does not charge for standard integration. In the event custom development is needed, ndd will provide a statement of work before a project begins. Almost all EHR vendors will charge a fee that the client is responsible for.

HL7 specifications can be found here.

  1. Local SQLite file-based database.
  2. On-premise Microsoft SQL Server database.
  3. Azure cloud-hosted Microsoft SQL Server database.

Please see the application note for additional information.

The facility is responsible for setting up and hosting either option. ndd requires a username and password if using an SFTP environment.  

The result HL7 message will consist of a combination of discrete results and an embedded base64 PDF attachment for the PFT report. If you prefer, we also offer the option of including a reference link instead of the embedded PDF.

No, a server is not required.

You can schedule a meeting with an integration engineer from 8 a.m. to 5 p.m. ET Monday through Friday. ndd can accommodate meetings outside of that timeframe if planned accordingly. The integration team can be reached via email at [email protected]. The support team can also be reached via email at [email protected] or by phone at (978) 470-0923.

You can find the product specification on the respective product pages. The specification contains a list of all supported normal values.

To get more detailed information about the supported parameters, age range, ethnicities and height range of each supported predicted set, please click here.

BTPS Correction is used to convert flow and volume measured at ambient conditions to the conditions within the lungs. Ambient conditions are called ATP (ambient temperature, pressure); the conditions within the lungs are called BTPS (body temperature, pressure, water vapor saturated).

Click here for more information.

All our products can be purchased through our authorized distribution partners. Please contact us to receive more information on finding your local dealer.

A compatible printer can be connected directly to the cradle provided with the device. Please consult our Printer Compatibility List including thermal printer options.

You can also use our free companion PC software, EasyOne Connect. The device is connected to the PC via the USB cradle provided. Data from the spirometer is synchronized with the PC database, allowing you to print to any printer connected to that PC or network. EasyOne Connect also allows you to view, trend and create PDF reports.

It is also possible to send pdf reports directly to a connected PC via file exchange.

The EasyOne Air uses the patented ndd Flow Tube, a single-patient-use mouthpiece which ensures that no contamination can reach the internal flow path of the device. This means that no cleaning is required between patients, and no calibration, ever. Simply toss the Flow Tube after each test session.

EasyOne Connect is the free companion PC software for the EasyOne Air. It can be downloaded directly from our web site. Here are a few of the features and benefits of using EasyOne Connect:

  • Long-term storage of test data
  • Ability to enter patient demographics from the PC
  • Connectivity with your EMR system
  • Ability to over-read and manipulate data on the PC
  • Export of data in many different formats, including the ability to create PDF reports
  • Bluetooth allows wireless viewing of real-time curves on PC display, or use of real-time animated/pediatric incentives
  • View and print trend graphs
  • Create custom test report templates

The on-board memory for the EasyOne Air spirometer can store approximately 10,000 tests. For long-term storage the data can be synchronized to the EasyOne Connect PC software database.

The EasyOne Air spirometer uses a rechargeable lithium-ion battery. An empty battery can be fully charged in about 5 hours. A fully-charged battery can support the performance of approximately 100 spirometry test sessions. While the battery life is highly dependent on the intensity of use, ndd generally recommends that the battery be replaced every 3 years to ensure the best user experience.

No. All EasyOne products are designed to not require calibration. ndd’s patented TrueFlow technology is the only technology proven to remain stable over its lifetime. A number of independent papers have been published that confirm this long-term stability.

For organizations like NIOSH/OSHA or Social Security/Disability, where calibration checks are required, ndd offers a 3-Liter calibration syringe. A calibration check (cal-check) is not to be confused with calibration. A cal-check simply validates that the device is within calibration limits. Unlike calibration, a cal-check does not adjust the calibration values.

Specifications EasyOne® Air

Quality, Medical Devices & Electrical
ISO 13485, ISO 14971, IEC 62366, IEC 62304, ISO 26782, ISO 23747, IEC 60601-1, IEC 60601-1-2, ISO 10993-1
510(k) clearance
Associations & Institutes
ATS/ ERS 2019 and 2005, NIOSH, OSHA, SSA Disability

Available languages
English, Danish, Dutch, French, German, Italian, Polish, Portuguese, Russian, Spanish, Swedish

Printing options
Direct to printer or with EasyOne Connect software
Data management
EasyOne Connect
HL7, XML, GDT, with software
Data links
USB, Bluetooth
Test storage
Up to 10,000 tests
Age range
Spirometry > 4 years
87 x 155 x 36 mm (H x W x D), 356 g, 3.4 x 6.1 x 1.4‘‘ (H x W x D), 13 oz
Device classification
Type BF applied part
Operating conditions
Temp 0 - 40 °C/ 32 - 104 °F, Rel. Humidity 5 - 90%, Atmosph. Pressure 700 - 1060 hPa
Power supply
5 VDC, Standby 0.3W
Rechargeable battery
Exchangeable, 3.6 VDC

ATI, BEV, EOTV, FEF10, FEF25, FEF25-75, FEF25-75_6, FEF40, FEF50, FEF50/FVC, FEF50/VCmax, FEF60, FEF75, FEF75-85, FEF80, FET, FET25-75, FEV.25, FEV.5, FEV.5/FVC, FEV.75, FEV.75/FEV6, FEV.75/FVC, FEV.75/VCmax, FEV1, FEV1/FEV6, FEV1/FVC, FEV1/FVC6, FEV1/VC, FEV1/VCmax, FEV3/FVC, FEV3/VCmax, FEV3, FEV6, FVC, MEF20, MEF25, MEF40, MEF50, MEF60, MEF75, MEF90, MMEF, MTC1, MTC2, MTC3, MTCR, PEF, PEFT, t0, VC, VCmax
ATI, BEV, CVI, E50/150, EOTV, FEF10. FEF25, FEF25-75, FEF25-75_6, FEF40, FEF50, FEF50/FVC, FEF50/VCmax, FEF60, FEF75, FEF75-85, FEF80, FET, FET25-75, FEV.25, FEV.5, FEV.5/FVC, FEV.75, FEV.75/FEV6, FEV.75/FVC, FEV.75/VCmax, FEV1, FEV1/FEV6, FEV1/FIV1, FEV1/FIVC, FEV1/FVC, FEV1/VC, FEV1/VCmax, FEV3/FVC, FEV3/VCmax, FEV3, FEV6, FIF25, FIF25-75, FIF50, FIF50/FEF50, FIF75, FIV.25, FIV.5, FIV1, FIVC, FVC, MEF20, MEF25, MEF40, MEF50, MEF60, MEF75, MEF90, MIF25, MIF50, MIF75, MMEF, MMIF, MTC1, MTC2, MTC3, MTCR, PEF, PEFT, PIF, t0, VC, VCmax
ERV, IC, IRV, Rf, VC, VCex, VCin, VCmax, VT
MVV, MVV6, MVVtime, Rf, VCext, VT

Quanjer 2012, Stanojevic 2009
North America
Crapo 1981, Dockery (Harvard) 1993, Eigen 2001, Gutierrez (Canada) 2004, Hsu 1979, Knudson 1983, Knudson 1976, Morris 1971 & 1976, NHANES III (Hankinson) 1999, Polgar 1971
Latin America
Chile 2010, Chile (Pediatrics) 1997, Pereira 1992, Pereira 2006/2008, Pérez-Padilla (PLATINO) 2006, Pérez-Padilla (Mexico) 2001, Pérez-Padilla (Mexico, Pediatrics) 2003
ERS (ECCS, EGKS, Quanjer) 1993, Garcia-Rio (SEPAR) 2013, Falaschetti 2004, Forche (Austria) 1988 & 1994, Klement (Russia) 1986, Roca (Spain, SEPAR) 1982, Rosenthal 1993, Sapaldia (Switzerland) 1996, Vilozni 2005, Zapletal 1977, Zapletal 2003
Europe Scandinavia
Berglund Birath (Sweden) 1963, Finnish 1982 (1998), Gulsvik (Norway) 1985, Hedenström 1985 & 1986, Langhammer(Norway) 2001, Kainu (Finland), 2016, Nystad 2002
Gore Crockett 1995, Hibbert 1989
Chhabra (India) 2014, Dejsomritrutai (Thailand) 2000, Indonesia 1992, IP (China, HongKong) 2000 & 2006, JRS 2001 & 2014
Mengesha (Ethiopia), 1985

Ultrasonic transit time
Flow Range
± 16 l/s
Flow Resolution
4 ml/s
Flow Accuracy (except PEF)
± 2% or 0.020 l/s
PEF Accuracy
± 5% or 0.200 l/s
MVV Accuracy
± 5% or 5 l/min
Volume Range
± 12 l
Volume Resolution
1 ml
Volume Accuracy
± 2% or 0.050 l
0.3 cm H20/l/s at 16 l/s

Part Numbers
EasyOne Air US
EasyOne Air International

Part Numbers
EasyOne FlowTube, individually wrapped, box of 50 pcs
EasyOne FlowTube, individually wrapped, box of 200 pcs
EasyOne FlowTube, individually wrapped, box of 500 pcs
ndd Calibration syringe 3L with EasyOne FlowTube Cal Check Adapter
EasyOne FlowTube Adapter


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