Sifam Sigma Series FM Frequency Meter. The pointer type frequency meters housed in moulded polycarbonate cases are suitable for the measurement of frequencies in the range of 45-65 Hz. For maximum accuracy, the essential measuring range is obtained by supressing the unwanted frequency span. These Frequency Power Meters offer several advantages in switchboard and Generating Set Panels. Linear scale Glass filled polycarbonate housing Kinfe edge pointer Easily replicable glass and bezel Panel mounting 45-55-65 Hz frequency range