Calibre is designed for optimal performance in indoor or controlled environments. Outdoor settings introduce factors that are more challenging to control and tend to interfere with the data being collected.

We do not recommend using calibre in environments colder that 10 degrees Celsius (50 Fahrenheit) as this causes increased condensation which can interfere with the accuracy of the data.

Do not use Calibre with any strong airflow blowing at the mask, such as a fan while riding on a stationary bike. Calibre measures the difference in pressure from the inside of the mask to the outside via the perforations in the har plastic, hence other airflow directed at the mask can disrupt accuracy while using the device.

While longer session durations are generally well within the capabilities of Calibre, we've seen numerous cases – primarily associated with high-intensity exercise – where sensor readings become degraded after approximately 25 minutes. This is due to excessive water buildup (from breath condensation and perspiration) entering the sensing module.

Continued use under these conditions is not recommended. We are working to address this problem, but in the meantime, we recommend limiting high-intensity sessions with Calibre to a maximum of 25 minutes, with the exception of our published protocols. If performing any high-intensity activity, the total session duration (incl. warm-up, cool-down, and moderate-intensity efforts) should not exceed 25 minutes. Moderate-intensity activities (up to about 10 METs or approximately 60 Liters/min breath volume) can be performed for extended periods without any issues.

To ensure proper operation and comfort, position the face piece so it covers your mouth and rests softly underneath the bottom of your nose (without inserting your nose into hole underneath).

It is very important to understand that Calibre is designed to be worn softly touching the face, unlike most all other devices that measure breath which are designed to be fit as tighter the better, our device should be worn loosely, but snug enough that it is not falling away from the face, avoid compressing the face piece too much, as it needs a sufficient interior volume to operate accurately. The face piece should be comfortable and secure, with the straps gently holding it in place.

Do not wash, rinse, or submerge the sensor module, as this could damage the internal electronic components and void the warranty. However, the facepiece/mask and other non-electronic parts are waterproof and washable.

You may clean the facepiece as often as needed, as long as the module is removed. Soap and detergent are safe to use—just be sure to rinse thoroughly and let it dry completely before reattaching the module.

To prevent water damage and ensure proper functioning, always insert one of the provided silicone plugs into the USB-C port before using your Calibre device. This plug acts as a barrier to safeguard the internal electronics from moisture.

Wipe any excess moisture from the outside of the module before charging, and ensure the module is dry before connecting it to a power source.

Calibre is uniquely designed to calibrate using ambient air, meaning there’s no need for specialty gases or equipment. To begin calibration, simply set the module on a stable surface in the same environment where you'll be testing. It doesn’t matter whether sensor module is snapped in to the mask or on its own — what matters is that it remains untouched and free from airflow.

You should avoid breathing near the device for approximately 30 minutes before calibration. This allows the surrounding air to properly diffuse into the internal sensing chamber. Be sure the space is free of drafts or direct fans to maintain a stable environment.

Once this period has passed, open the app and connect your Calibre device. You’ll be prompted to calibrate — just follow the instructions. During calibration, a soft yellow light will pulse for about 10 seconds. When it stops, your device is fully calibrated and ready for accurate use.

There are no consumable or replacement parts needed for Calibre and there is no regular maintenance or servicing required, although we highly recommend you update the firmware anytime we issue one for optimal capabilities.

We issue new firmware updates at no cost and they are available through our app.