Perfectly suited for factory machinery calibration, commercial generator room, and residential workshops requiring realtime electrical parameter verification Ideal for industrial electricians, facility managers, and homeowners seek accurate voltages/frequency tracking in appliance diagnostics Featuring 72x72x61mm housing with shock resistant design, this lightweight meter combines space saving installation and long terms durability for demanding environment The frequency meter wide voltages compatibility (100V/220V) and precise 45-65Hz frequency measurement, ensuring reliabled power across electrical systems This double function frequency meter and voltages monitor safeguards equipment by detecting power fluctuations in HVAC systems, production lines, and backups power setups, Manufacturer: YOUKELAI