I got my Keto Mojo device today. I unboxed and used it. Then I did it again and recorded it. I got 3.5 and 4.0 mmol/l for my values. That's usually seen on days 3-5 of water fasting. Why did I see it so early? I'm only 1 day into my fast. I've been doing 60 -72 water faster once each week for a month. And I stay low carb. I've lost about 10 pounds and feel great. So my body is already into a major fat-burning episode.
The Keto Mojo gets good reviews from John and others. And ketosis is important: it shows you're burning fat.
https://thequantifiedbody.net/5-day-water-fast-results/
https://keto-mojo.com/help-center/