Yes, I have been using the Egg-O-Meter, and I really like it. It has eased my mind more than once when the air temp changed while turning, adding water, etc. It showed that the internal temp of the egg doesn't change as rapidly as the air. I also like the alarm feature. I set it to let me know if the temp goes down to 99 or up to 101. It also keeps a record of the high & low temp the egg has reached throughout incubation. For under $20, I have been pleased with how it works.