健康试纸
产品描述 取一条试纸,将唾液滴于试纸的一端,即刻与比色卡对比,所对应的颜色下方数值即为现在唾液的酸碱度。 人体正常PH值为7.35-7.45,平均为7.41,呈弱碱性,如果人体内的PH值低于7.35,就称为酸性
Bottle Cap Screw RIng Polypro 38mm
Cap Screw Ring for bottles with a 38 mm cap. This Screw Ring is made of Polypro and has a Stainless Steel Band to keep t