{
  "synthetic": true,
  "instrument_id": "TEACHING-01",
  "reported_twa_ppm": 0.03,
  "twa_period_minutes": null,
  "twa_start_time": null,
  "reset_history": null,
  "wearer_assignment": null,
  "sampling_location": null,
  "note": "Reported TWA is a deliberately arbitrary exercise value, not a calculation from measurements.csv. Its metadata is intentionally incomplete."
}