I would highly suggest running the salt test on the hygrometer. They do loose accuracy and brand new doesn't mean anything. My brand new thermometer ended up being 6 degrees off! Cost me my very first hatch. :-(I have a separate hydrogometer which has proved to be quite accurate on my first incubation over the last 4weeks
I may buy another to make sure, it's reading 60% but there is no water in the incubator, it's bran new