Technique to get consistent measurements

We have done thousands of breath ketone measurements and developed a technique that will give you the most consistent results. 

By coaching hundreds of people, we have found the most common mistakes and how to mitigate them. Carefully read  the instructions below and practice, it does not cost you extra to measure a few extra times, its a reusable device!



A common natural reflex is to breathe in before blowing into something, but this is not what you want. Prepare yourself to not take in air when you put the mouthpiece to your mouth.

Woman taking air before exhale into Ketonix


Breathe normally ...

Breathe calmly for a minute and prepare to continue exhaling into the mouthpiece after your normal exhale through your nose.


Breathe out ...

Breathe out through your nose ...


then continue ...

without taking new air in, continually breathe out into the mouthpiece until you can't produce any more air out.


... remove device from your mouth and breathe in again

Once the last air is expelled from your lungs and is exposed to the sensor, remove the device from your mouth and breathe in again.

Press "Done that"

Let the sensor have a few seconds more to analyze.

When it is ready, it will show the "Skip" and the "Save" button, but do not press either yet.pressing the "Done that" button). The result from doing the test the first time will still be on the screen at the start. If the result of testing a second time is lower than the first, this number will not change, but if it is higher, the number on the screen will also increase.

Then, when your breathing is back to normal, again repeat steps 2 to 5. And again the number will only change if the result is higher.

Now you can click on "Save" and only the result on the screen - the highest result of these three tests - will be saved and the gauge resets.

After using it a few days, you will "feel" when you made a good sample and you rarely need to do three samples in a row to get your highest reading.


If you want to turn off the Ketonix

While the gauge resets, the message on the screen "Wait, gas still in sensor" asks you to wait until the sensor is ready to be turned off. Once the screen shows the "Done that" button again, you can turn off Bluetooth (and Wifi and Location) on your phone and disconnect the Ketonix from its power supply.

Why Choose Us?

We use our product!

The founder of Ketonix have epilepsy and needed a tool to manage his ketosis. We who work here use a low-carb diet for health and stay focused, the Ketonix device enables us to tweak our lifestyle and optimize our performance.

Our Support is in Ketosis
Money Back Guarantee


Our mission is to provide a simple, cost effective and painless method to know if your body is in ketosis and the strength of it. With the insight of your level of ketosis you could adjust your actions to increase/maintain your ketosis.

Ketosis is when your insulin levels are low and your liver starts to metabolize fat into ketone energy. When ketones fuel our brain we sense a high mental clarity and energy boost. Without the ability to get into ketosis when glucose and glycogen is low the human man kind would not exist.

Ketosis is not the the same condition as Ketoacidosis. Ketoacidosis is is a complication of type 1 diabetes mellitus. It's a life-threatening condition resulting from dangerously high levels of ketones and blood sugar


Ketonix® analyze your breath for the ketone named Acetone. Acetone is spontaneously released from the liver when ketone energy is formed.

The more fat that is mobilized into energy, the more Acetone in your breath.

Don't mixup breath ketones with blood ketones. Blood ketones are formed from excess ketone energy and could be converted back into energy at any time. In some situations one could say that they correlate, higher breath ketone level and you might find more blood ketones. Then add that your body could have issues both creating them and use them for energy, these factors makes it harder to interpret blood ketones. This is one of the reasons Ketonix® was invented, to indicate the strength of ketosis.

KETONIX® - Breath Ketone Analyzer - The Original Biohackers Choice Since 2013

​ KETONIX® is a Non-Invasive Class I Medical Device, registered at Läkemedelsverket (SE).
KETONIX® is a Registered Trademark in the US, Australia, Europe, and other countries.
Ketonix AB is a Swedish Registered Company - VAT SE556443379401

© 2023 Ketonix AB. All Rights Reserved.