Abstract: It is an object of the present invention to provide a method for forming a thin-film layer on the outer surface of a sensor, by which a thin-film layer formed on the surface of a sensor used for measuring the concentration of elements contained in the measurement object such as a molten metal, slag, or gas, can be easily provided with a complex pattern shape of small thickness and a uniformly arranged pattern shape. The method is provided for forming a thin-film layer of a sensor composed of a solid electrolyte which is a molded body having an inner space, a reference substance filled in the inner space, a reference electrode connected to the reference substance and led out to the outside of the inner space, and a thin-film layer comprising a ceramic powder or a metal powder as the main component and formed on the outer surface of the solid electrolyte in such a manner that part of the outer surface is exposed. This thin-film layer is formed by printing.

Abstract: A small-size electronic apparatus includes a plurality of units each having a circuit board and an independent housing accommodating various functional components on a function to function basis. Desired ones of the units can be interconnected by a connector or connectors which may be in the form of a cable having a connector elements at its two ends with which interface portions of the units are inter-connected, or a connector pair having a male connector element and a female connector element which permit direct interconnection for the units to be layered one on top of another. The connectors permits the removal or assembling of the units without requiring any tools, and the provision of additional units with no limitation being imposed on the number of units.