A rotational angle sensor detects a rotational angle of a rotary member based on a magnet field produced across the rotary member by a pair of magnets. The method includes receiving a first image of a microfluidic device. The oxide means is a copper oxide, e. One example of such authentication schemes is the use of password protection to lock or unlock the device in which the contactless payment functionality is embedded. The agent contains, as a developer-type oxidation dye precursor, a compound of Formula that carries at least one cationic charge in Y. Furthermore, when the distributed information is recorded, the apparatus records attribute information indicating that together with the encoded distributed information.