DROKxae; 0.8'' LED Digital Frequency Panel Meter 50-60Hz AC 0-500V LED Electric Reading AC 220V Power Supply DP3 Digital Frequency Meter for Scientific Research Precision Measurement Interior adopts monolithic IC circuit elements and high stability, advanced design of circuit. Measure range of Voltage Frequency : 50-60Hz (AC 0-500V). Accuracy class:  (0.5% +1 digit). Working temperature: -10  ~ 50 . Wide application:various instruments,teaching equipment,industrial equipment,medical equipment, etc.