This specification covers electronic instruments intended for intermittent monitoring of patient temperatures. The temperature range of the instrument shall display temperature within the specific range requirement and regards to its accuracy, no individual reading shall be in error by more than the values that are determined. The operating environment must meet the determined accuracy requirements when operated in an environment of a certain temperature and also with a certain relative humidity. The resolutions of analog display such as Celsius graduations, Fahrenheit graduations, scale graduation marks and pointer width shall also be observed. Its digital display shall conform to the standard resolution, readability and buttery condition of the material. The case material of the instrument and non disposable accessories shall withstand biological and physical cleaning without performance degradation. It shall also withstand dropping without presenting an electrical safety hazard. Those parts of the electronic thermometer system intended for contact with anatomical sites for the purpose of temperature measurement as specified by the manufacturer shall be also be nontoxic. The following tests shall be conducted in order to determine the instrument's performance: cleaning test, toxicity test, and accuracy test.