I read reviews from years ago with meter issues with this unit. I figured they would have worked that all out by now. I get the unit in record time, great job Amazon! I power it up and it shows 10V on the meter. My very expensive ham radio needs 13.8v. I pull out my digital VOM and bingo, 13.8v. I try to adjust the analog meter, but its just for zeroing. If you need a power supply, buy the cheaper unit without meters.