Single Phase Pre-payment Watt Hour Meter

* Active electric energy measuring and no calibration needed within service life;* Prepayment energy consuming system by use of IC card, Protecting against tamper & fraud ;* One meter with one IC card which adopts special security measures, safe and reliable;* Warning when residual energy is deficient to remind users of purchasing energy in time, trip at overload automatically and recording the numbers of tripping;* Collecting card backward reading user's ID and the accumulative energy;* Display IC card advance purchase energy, remaining energy, accumulated energy, preset load-limit, alarming energy limit, maximum load, current load;* Wide limit temperature range;* No deviation occurred under normal delivery condition, calibration is unnecessary before installation and random installation location.