Transverse probes, most often rectangular in shape, measure fields normal to their stem width. They are useful for most general purpose field measurements and are essential for work in magnet gaps. Several standard stem lengths and diameters
are available, as well as flexible, cryogenic, tangential and brass stem probes. Tangential probes are transverse probes designed to measure fields parallel to and near a surface. The active area is very close to the stem tip.