I bought a digital temp /humidity gauge at TS. TS is an hour from me and it was the only one they had. Temp is correct I have 2 other thermometers reading the same. My problem is humidity. I have a flat round pan full of water with a sponge. And humidity stays at 16% I added another wet sponge and nothing changed. Surely with all that I should be higher. For now I'm stuck til I can get a new gauge in mail. What to do ? Egg in there.