CRITICAL TEMPERATURE INDICATOR

摘要

PURPOSE: A critical temperature indicator is provided to separately store a development material member and a development medium member and to delay-control a critical temperature display. CONSTITUTION: A critical temperature indicator comprises: an upper section(30) which includes an operating button(31) which accepts a development material member and wherein a cap member is included to be projected at the center to a circular shape, an extension section(37) which is horizontally extended from the operating button to a fixed distance, a first compartment(32), and a display window(36) which is projected to a concentric circle with being contiguous to the circumference of the first compartment; and a lower section(50) which includes a concentric circle which is located on the lower surface of the upper section and moves a development material and a sheet(52) which is one shape of helix or zigzag.