1.FREQUENCY TEST: This panel meter is designed to measure the frequency in an AC power grid, featuring a wide range of 45 to 55Hz. 2.HIGH ACCURACY: Boasting a Class 1.5 accuracy, this frequency tester offers high stability and a clear scale, making it very convenient and practical. 3.WIDE APPLICATION RANGE: Primarily used in industrial and mining enterprises, metallurgy, chemical industry, electric power, complete equipment, and various electronic control devices, this frequency meter is highly versatile. 4.EASY TO USE: This frequency meter can be panel-mounted for control and power distribution systems. Its compact and lightweight design ensures simple installation and operation. 5.ABS SHELL: Constructed with an ABS plastic shell, this frequency meter exhibits high strength and resistance to damage.