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