The Anfibios and their less featured but very good sibling the Simplex both come from the FORS/Impact line of Nokta detectors. The Kruzers and Multi Kruzer come from the Racer line of Makro detectors. They do have their similarities but at least for me, the Anfibio/Simplex are deeper, more stable and handle mineralization and saltwater beach scenarios better than the Makros considering they are all single frequency detectors.