hangzhou qiwei instrument co., ltd-k8凯发手机app下载

through respiration and decomposition, dissolved oxygen will be consumed in water, and the dissolved oxygen meter mainly relies on air and photosynthesis to supplement. the amount of oxygen in wate...

light from one medium into another medium will produce refraction phenomenon, and the ratio of the incidence angle sine is constant, this ratio is called refractive index. soluble solid content in ...

the hand-held saccharometer is used for the rapid determination of the concentration or refractive index of sugar-containing solutions and other non-sugar-containing solutions. widely used in sugar...