This standard applies to the calibration of electric air blowing dryers in laboratories, as well as the calibration of similar equipment. The documents cited include "General Requirements for the Safety of Household and Similar Electrical Appliances", "Safety Requirements for Household and Similar General Purpose Electronic and Related Equipment Powered by Grid Power Supply" and "Safety of Electric Heating Equipment". The standard aims to standardize the calibration conditions, items, methods, result processing and calibration period of electric air blowing dryers to improve the calibration mass. Blast drying oven is a common laboratory equipment used for baking, drying, heat treatment and Miscellaneous heating purposes. Its working principle is to provide heat through the electric heating system, the motor is blown, and the hot air convection in the box is promoted to keep the temperature uniform, and the automatic Control system keeps the temperature constant. The standard also stipulates the requirements for Appearance and functional display, such as Specification model, Manufacturer, factory number, Rated power, environmental conditions and power requirements on the sign.