I can't seem to find the minimum temp range for this incubator. Will it maintain a low enough temperature for queens? I've pulled mine out from years ago. Manual adjustment, not digital. Hopes are to graft in about an hour, but I'm not sure I can trust this incubator. Believe it or not, the still air incubator I used last time did work, but it is huge and doesn't have a fan to circulate air.