Manual device for the determination or measurement of photometric data using a measuring head

Manual device to measure photometric data comprising:

• a support surface to be placed onto a flat measuring surface;
• a measuring head movably mounted in a housing in an essentially straight line manner and parallel to said support surface, said measuring head being capable of movement between a rest position in which a measuring diaphragm serving to position the manual device on the measuring surface is visible to a user, and a working position in which the measuring head covers said measuring diaphragm, said measuring head further being mounted on a motor-driven measuring carriage movably located in the housing of the manual device;
• a drive motor being fastened to said measuring carriage for movement therewith;
• a drive pulley actuated by the drive motor for moving said carriage, said drive pulley being equipped with a crank pin for engaging a slide guide mounted stationarily in the housing, the crank pin being rotated out of the stationary slide guide at a beginning of a measuring process;
• and,
• a rotating shaft coupled with the drive motor of said measuring carriage by which the wavelength range of the measuring head may be scanned.