GREAT PERFORMANCE - This electric meter features high reliability, small volume, light weight, beautiful appearance, advanced technology, standard 35mmDIN guide rail installation, etc. WIDELY USED - This energy meter is suitable for measurement of active electricity in single phase AC 50Hz rated frequency, used for indoor fixed installation. This single phase meter can measure positive active energyin the measurement of electrical energy, which is clearly displayed by the LCD backlight screen. LONG SERVICE LIFE - This single phase energy meter has good anti-electromagnetic interference, low power consumption, high precision, high overload, high stability, long service life and long service lifeof life. TWO ROWS OF LED DISPLAY - The top row displays the temporary power consumption meter and can be cleared. The bottom row shows total power consumption and cannot be cleared. WORKING ENVIRONMENT - apply to the environment the temperature is -25-55, the relative humidity is less than 95 percent , and in the air does not contain corrosive gases and avoid dust, mold, fog saline, condensation, insects, etc.