... precision 3.stable frequency GTP Program-controlled variable frequency power supply pictureTechnical characteristic: 1.High-precision, stable ... precision, screen digital display: frequency, voltage, current, power, power factor. 3.Quick response for status, regulating voltage ... *1020490GTP616060600GTP611001001500*800*1020850GTP611501501800*800*10201200GTP612002001800 variable-frequency power source