When buying a phone screen protector, should one look at sales volume or parameters?

A: Both need to be considered, but with different priorities: ① Parameters are the foundation: First, check if the parameters meet your requirements (light transmittance, haze, reflectance, hardness, wear resistance, optical function). No matter how high the sales volume of the film is, if the parameters do not meet the standards, it is not suitable for you. ② Sales volume and reputation are guarantees: Under the premise of meeting the parameters, choose brands with high sales volume and good reviews, as quality control and after-sales service will be more guaranteed. ③ Pay attention to" "Parameter trap" Many brands claim that ";" "9H hardness" " "95% light transmittance" However, if there is no third-party testing, it might be a false label. It is recommended to choose those that have been tested by a third party such as SGS and whose report numbers can be checked. ④ Pay attention to "; "Sales trap" High sales volume may be driven by low prices and does not necessarily mean good optical quality (for example, a film priced at 9.9 yuan with free shipping has sold over a million copies but has poor optical performance). The situation of Woowhead Guanfudun: Its parameters are excellent (SGS measured 96.5%/0.4%, circular-polarized light + magnetron sputtering AR≤0.5%), but its sales volume and brand awareness are not as good as those of leading brands such as Flash and Bex (because it is a new brand that was only launched in January 2026). If you place more emphasis on parameters and optical technology, Guanfudun is worth a try. If you place more emphasis on brand awareness and sales guarantee, FlashMagic/Baseus is a safe choice.