Some embodiments of an instrument for a flow meter can automatically adjust in response to the rotational direction of the drive shaft of the flow meter, thereby permitting the instrument device to perform its intended function regardless of the fluid flow direction through the flow meter. The heat conducting slug includes a first slug, a second slug formed on the first slug, and a third slug formed on the second slug, wherein the light emitting chip is mounted to the third slug, and the second and third slugs respectively shaped to have edges are arranged to cross each other. The removal of benzene increases with the increase of impregnated iron percent in the multi-walled carbon nanotube. A state is determined for the basic context region based upon a pattern of unique image tones among the context pixels therein. The power supply fan is dimensioned in such a manner that it extends over at least one edge of a surface on which the power supply fan is fastened in such a manner that the interior of the power supply case and any electronic components adjacent to the power supply unit are supplied with an air stream. After that, excess material of the strip is cut off.