They range from $ , so they are a pretty expensive upfront cost. We recommend that if you’re new to ketosis, you wait to buy one until you’re at a more advanced level. While breath meters are expensive upfront, it is much cheaper than the regular purchases of blood ketone strips. In the long-run, the most economical value for the results would be a breath analyzer – since you can reuse it as many times as you want. Besides being inaccurate if you’ve been in ketosis for a long time, the sticks can also give varying results based on your hydration.