Too late then, they've already warmed up to incubating temp and development is beginning. Pour in a bit of water, then tomorrow head to the nearest pet supply store and pick up a gauge for humidity. They are located in the reptile section. The problem with Janoel, and their knockoffs, is that the whole bottom is a single reservoir making it difficult to make adjustments. Humidity is about surface area, not volume, so whether there is a tiny bit of water in the bottom or if it's filled completely, the humidity reading will be the same. Sponges are the best way to manage humidity in these sorts of incubators so as to control the surface area that is dampened.