Hello Dear concerned polymer scientist or technical fellows, I am looking for a four point probe measurement system to buy, which will be easier to use and test my polymer hydrogel may be in both dry and wet condition. I am not sure if I can use Four point probe to see the surface resistivity of wet hydrogel. So any kind of idea, link, company name or help will be highly and cordially appreciated. I don't have any rough idea about how much the surface resistivity of my hydrogel could be. so possibly looking for some suggestion (the more resistivity range the better). Eagerly waiting for your response. Thanks