AC 100V 220V 380V Analog Panel Frequency Meter Tester Gauge for Hertz Indicator 45-55Hz Features: brand new and high quality. Used widely in the electronics, automatic control system, mechanical equipments, shipbuilding, aviation, etc. Installed on the display panel and switch panel for the control system and power distribution systems. Designed to measure frequency in A.C. electrical power system. Black character, white background, square panel mount, analogue display. Specifications: Color: white+black Material: plastic Accuracy class: 1.5 Voltage: AC 220V Frequency: 45-55Hz Note: Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1 Analog Frequency Meter