[Application] for measuring single-phase AC active electrical 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, mildew, salt fog, etc. [liquid crystal display] 6+2 digits liquid crystal display shows the total amount of electricity. [accuracy] the device fully complies with the technical requirements of the international standard iec62053 for single-phase class 1 or 2 energy meters, allowing direct and accurate 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, 35mmdin standard rail installation, etc.