Breath Meters

The Lumen device is the closest to reliable among consumer breath meters and is priced around $600. Breath meters measure acetone rather than the more metabolically significant BHB. Sensors in most consumer breath meters are not replaceable, so accuracy degrades permanently with use. Alcohol, sugar alcohols, lozenges, and gum can all trigger false positive readings on breath meter electrochemical sensors. The heat-based sensor recovery cycle used in breath meters can worsen sensor contamination over time. No consumer breath meter is suitable for identifying dietary trigger foods because many common food items generate false positives.