These pad tools measure the formation microconductivity directly through an array of resistivity buttons that are pressed against the borehole wall. Accordingly, they require a conductive mud rather than an oil based one. Electrical image tools normally provide the best high resolution borehole images in conductive muds. From image tools, bedding, fracture features, faults and stratigraphic features can often be identified and quantified (The example on the left of a 256 button, 8 pad FMI shows fractures and bedding). Dipmeters have fewer buttons (four, six, eight, or twelve buttons), so though bedding features are easily identified, fracture features are not.