I'm wanting to do a dry hatch but wondering if my humidity is just to low and will I have to add water? I bought an accurate digital and then a normal thermometer and the hovabator has its own. I'm reading just slightly different in humidity on both. My humidity is staying between 18%-20% and even with a dry hatch is this to low? I opened the vent hole to see if it might make any difference but won't check til morning. What do you think? Temp is dead on, on all 3 so that is good. Im interested to see what the high/low will be from Overnight.