Verifiable sources
For every product, we cross-check three sources: manufacturer spec sheets, Amazon and Google user reviews (a minimum of 500 weighted reviews over 12 months) and independent tests from European consumer and specialist publications (Which?, Stiftung Warentest, Que Choisir, OCU, Altroconsumo, Consumentenbond). If the three sources don't agree on a product, it doesn't make our shortlist.