I calibrated my digital(Acc-Rite) Wednesday before I set my incubator up. My hydrometer was reading 68% so I have been adding 7% to my humidity. I bought a Flukers hydrometer yesterday at the pet store and calibrated it yesterday and it was reading 78% so I have been subtracting 2% off the reading of it. I have both in the incubator since last night and I am getting the same exact reading 35% now when I don't add or take anything away. If I add to my digital or subtract from my Flukers then I get completely different readings. Should I re-calibrate the hydrometers or go by the readings they are reading?