Affiliate disclosure
Short version: some links may earn us a commission. Scores never move because of it.
Some links are affiliate links: if you buy through them, we may earn a commission at no extra cost to you. It never changes our scores.
Our scores and rankings come from a published formula applied to what each brand publishes. One sentence on method: we compare product pages, spec sheets, guarantee and warranty terms and the FDA wording each brand uses; we don't run our own trials of the devices. A brand can't pay to change its position, and a device whose maker has no affiliate program is ranked exactly like the others.
Buttons that leave the site point to the brand's own product page. They are marked rel="nofollow", and become rel="sponsored" once a partnership is active.
Questions: [email protected].