5 Key Takeaways

• 1

  The convolutional spectrometer uses near-infrared light to measure glucose, lactate, and alcohol through the skin without collecting blood.

• 2

  The packaged device measures approximately 4.8 × 6.2 cm, weighs 16.5 g, costs an estimated $10 in components, and processes spectra in less than 0.4 seconds.

• 3

  In approximately 6,000 spectra from 126 participant sessions, mean absolute errors were 0.36 mmol/L for glucose, 0.81 mmol/L for lactate, and 1.70 mg/dL for alcohol.

• 4

  A personalized model tracked one participant’s glucose fluctuations over several days with a mean absolute error of 0.16 mmol/L.

• 5

  Glucose prediction models did not transfer reliably between individuals, and the technology remains experimental rather than a validated alternative to laboratory testing.