PURPOSE: To make it possible to manage temperatures at multiple points, by memorizing the measured temperature data at the multiple points, data of the measured places and time data, and reproducing the data on a display.

CONSTITUTION: A temperature sensor 10 is set at, e.g., a part No.1, whose temperature is to be measured in a warehouse, and the temperature is measured. Then the temperature and the measured-place data No.1 are displayed on temperature and No. displays 32 and 34. The measured time is displayed on a time display 53. When a memory switch 62 is turned ON, the data of the temperature, place and time are stored in a memory 41 through a CPU40. The stored data are read by turning ON a reading switch 64, and the data of the temperature, place and time are reproduced and displayed on the displays 32, 34 and 35.