five, with one.33 preferred. You'll also need to keep using readings and raising your spacings at those intervals till your spacings are at the least as good given that the depth you are trying to study, ideally two or 3 times as good. This will surely mean numerous dozens https://soil-electrical-resistivi77654.blogmazing.com/28932525/examine-this-report-on-soil-resistivity-testing-solutions-bangladesh