The power-frequency converter denoted, "power frequency induction watthour meter converter" (PFIWHMC) is illustrated.The PFIWHMC is based on the induction watthour meter (IWHM) which is equipped, on its ax, with a mini-magnet, faced to a reed relay in the C form. At each ax turn the magnet actuates the reed relay which then releases. The reed relay by a battery generates an output square wave voltage having frequency proportional to the power supplying the IWHM.