You can buy something similar! A company in the UK has a breath sampler, which collects exhaled air, which is then analyzed using medical machines for diagnosis. Hope they can sell breathalyzers that offer an instant diagnosis soon! In the meantime, you can order the sample here https://www.owlstonemedical.com/products/reciva/

ReCIVA® Breath Sampler

Link: https://www.owlstonemedical.com/

Reliable and reproducible, non-invasive Breath Biopsy® sample collection