FIELD: thermometry, remote control and temperature adjustment systems. SUBSTANCE: method recording attainment of threshold value of temperature is based on use of forced spreading of molten mass. The latter is made from material with specified melting temperature. Light guide is placed along direction of spreading of molten mass. One mechanically acts on light guide breaking its integrity when threshold value of temperature is achieved. Attainment of threshold value of temperature by object is recorded by fact of interruption of luminous flow. EFFECT: expanded application field. 1 dwg
