Surface coatings, and method of forming the coatings, are provided. The upstanding section is positioned between the first scale-supporting section and the finger-resting section. The invention further relates to FETs and other semiconducting components or materials comprising the novel polymers. The finger ring with the charm is securable to a user’s finger when the flexible band is wrapped around a user’s finger and the clasp is in a joined state. According to various embodiments, there is further provided further processing of the collection of data, andor gas detection, before generation of the third image with adjusted pixel values. At least one control unit controls the first and the second voltage source converters.