Ok, so I put it in a metal valentine candy container, all I had. I put in half a cup of salt, again, all I had. And I placed it and the salt in there about a day and a half ago, last night it read about 40%. Today, it was at 60% humidity. Checked an hour ago, still at 60, so does that mean it is 15% off than what it is supposed to say? Since someone told me it should be 75, so any more or less you need to add or subtract when I use it. Should I use more salt? It's one of those that looks like a clock, so it has an arm, can I move it now when it's at 60, up to 75 and then I don't have to do math later? Please help, thanks!!