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Whether the power line is 50 or 60 cycles per second , it is worth noting that utility companies make a major effort to keep the frequency of the electric power they deliver constant ; in the United States , the interconnected electric utility companies maintain an accuracy over the long run of better than 1 part in a million , so systems using power-line-clock hardware are generally quite accurate . If any verification process fails to identify the correct site , the process must be immediately halted until verification is completely accurate . In adding this information , is the Literary Agent strictly accurate in his portrayal of various events and aspects of life in America ? At least according to media reports , the administration did not have accurate information about who was going to attend the dinner targeted by the airstrike and still lacks full information about who was there and who was killed . The seizure-predicting dogs were accurate about 80 percent of the time .