Abstract
The present invention provides a sensor having chemical inspecting function and the inspecting material contained therein. In simple terms, one of the major features of the present invention is to reduce the detection area contacted with air between the gel and the inspecting material so as to slow the degradation thereof. Another feature of the invention is to provide the detailed compositional parameters required by the inspecting material in the said process so as to obtain a balanced value between the cost and the visibility. By the present invention, the problem of short retention period of the personal hygiene item is herein solved.