Contour probes produce magnetic fields on ferrous materials. These probes can have AC or DC functions which are used to detect surface defects or weaknesses. Berg offers a wide range of probes that have AC functionality, DC functionality or both. We also offer kits that include battery packs, chargers and carrying cases. Please browse our products to find the best one for you. If you have any questions, please give us a call at 1-847-577-3980, or send an email to email@example.com. Our staff is there to help.