I am new to tattooing and am just researching online now. I have a cheyenne sol nova pen that can operate from 4.7-12.6 volts. The power unit I have is a cheyenne power unit 1 and only displays the stich frequency ( not voltage ) from 60-160 HZ. What I have read is that it is preferred by most artists to shade and color pack at 8-10 volts. And line work is best at 7.5-8.5 volts. How can I convert the HZ to voltage so I can stay within these recommended voltages? I just want to start practicing on fake skin and dont know what number to start with shading and lining