To make the 75% point I just need ordinary table salt and water. I need to make a chamber without the need for salts all the time, just need it somewhat stable and be able to go to maybe 10% rh. One salt point is ok but don't want to change it all the time. The room has strick climate control...
This forum seems the closest for this project. I am trying to build a humidity chamber to check various humidity/dew point devices. I was going to build a chamber with two layers of plexiglass. Between the layers I was going to pump in dry compressed air to lower the humidity and that would be...