[Scope of application] for measuring single-phase AC active electric energy at rated frequency 50hz or 60HZ, for indoor fixed installation, the applicable ambient temperature is - 25 ~ 55 , relative humidity 95% and the air does not contain corrosive gases and avoids dust, mold, salt fog, etc. [liquid crystal watch] 6 + 2 digit liquid crystal display shows the total amount of electricity. [precision] the device fully complies with the technical requirements of the international standard IEC62053 for single-phase energy meters of class 1 or 2, allowing direct and precise measurement of the active electrical energy used. [anti - interference] with good anti - electromagnetic interference, low power consumption, high precision, high overload, high stability, anti - electricity theft, long life, etc. [advanced] features high reliability, small size, light weight, beautiful appearance, advanced technology, standard 35mmdin rail installation, etc.