• Marie, médecin, 6 mois de suivi DPD

Marie, doctor, 6 months of DPD tracking

Paul Fournier

— WEEKLY EDITION · TUESDAY JUNE 23 —

She arrived with 3 sceptical questions.

Marie L., 42, general practitioner in Paris 7ᵉ. She bought ELITE 9K in November 2025 with 3 precise pre-purchase questions (exchanged by email with our engineer within 4 hours, as always).

She kept a DPD journal twice a week for 6 months — 26 measurements. Median 9,080 PPB. Standard deviation 240 PPB. No significant drift.

Her shared conclusion: «I'm sceptical by nature. DPD is the only credible method. 9,000 PPB confirmed across 26 measurements. The 5-year warranty is reassuring.»

Marie has agreed that her journal be made available to La Source members starting this week.

26 Marie's measurements · 9,080 PPB median · 240 PPB Standard deviation

«Sceptical customers are our best validators. Marie measures more than we do in the lab.»
Paul Fournier · HYDROGENYX Founder

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