WSHT provides an accurate reference system for your IEF experiments. The small molecule pI marker​ is a visible colored ruler for quickly verifying the linearity and accuracy of the gel's pH gradient. The protein pI marker​ consists of standard proteins with precisely known pI values. It can be co-electrophoresed with samples, and by constructing a standard curve, it enables precise quantitative analysis of the isoelectric points of target proteins. It is an essential tool for quality control and quantitative research.