Ok I have a full size refrigerator converted into an incubator. I ran the Inc. for one month with egg boxes inside. I have a helix therm. to regulate temps. I checked almost daily the temps inside the egg boxes with a temp gun. At this time i only had the 6q tubs with no sustrate inside. Every tub was 88.5- 90 degrees without substrate. I would just shine the ray from the temp gun on the bottom of the tub. So i thought everything was working well. I am expecting the first clutch of the season on May 31. I went ahead and added peralite in the egg box and place my themometer/hygrometer in the egg box. The themometer is reading 89 with 95% humidity. But when i shine the temp gun on the substrate i get a 85.5 degree to an 87 degree reading. Shouldn't the substrate be 89 like the air temp in the egg box?