I use a number of different types of variable voltage bench power supplies. I run a small company and we cannot afford top of the line equipment and we do not require government calibrated units. My company works on electronic and software designs and I have not only used this unit extensively I have also taken the cover off and looked at the internal design, not because there was an issue, but to compare it to a similar looking unit that had a very bad design which failed hence needing to purchase this replacement.