This standard applies to the calibration of Electrically-heated thermostatic water baths in laboratories, as well as the calibration of similar equipment. Among the cited documents are "General Requirements for the Safety of Household and Similar Electrical Appliances", "Special Requirements for Safe Storage Water Heaters for Household and Similar Electrical Appliances" and "Safety of Electric Heating Equipment". The standard aims to standardize the calibration conditions, items, methods, treatment of results and calibration period of Electrically-heated thermostatic water baths to improve the calibration mass. Water bath is composed of three parts: pot body, electric heating body and temperature control system. The shell is stamped and formed with high-quality steel plate, and the liner is made of red copper plate. The middle layer is filled with thermal insulation materials and is equipped with electric heating pipes and metal temperature control originals.