Specifications: 1) Working life: more than 15 years 2) Bi-directional measurement of single phase AC active energy 3) Logical resistance to running with no-load 4) Photoelectric isolated pulse output function for easy digital collection 5) Resistant to tampering and attempted theft a) Short circuit of inlet and outlet wire b) Exchange inlet and outlet wire c) Magnetic field meter 6) High accuracy, high stability, no need for regular calibration 7) Wide test range, perfect over-load ability 8) High reliability design and workmanship: a) Uses industrial-grade and international brand name electronic components, using less power in the long run b) SMT manufacturing workmanship c) Lower power consumption d) Lower starting current Inner packing: Dimensions: 150 x 112 x 56mm Weight: 450g