路昌LF423频率计数器|路昌LF423频率计数器|路昌LF423频率计数器
LINE FREQUENCY MONITOR Model : LF-423 * 0.5 to 500 Hz (x 0.01 Hz, < 100 Hz) * Input voltage : 5 to 250 ACV. * Check frequency to DC to AC converter, mobile & portable generator, power line.