I have a new 1588 also with a bit of difficulty keeping the humidity up. I had too high humidity last year with my old incubator, so I'm trying more of a dry hatch this time--30-35%. But it would only read 15% with no water. I'm using 2 shot glasses now, but have to refill twice a day. Probably will try sponges next. The outside and household humidity are also low right now, so I have to keep a close watch. In the past with my old incubator if I filled the 1st reservoir, it got too humid.