I don't know where this 102 number came from lately but the number that is been quoted for years is 101. Yes 102 would work but would hatch them early an there is not much play room between it an 103 which is bad. But yes the temp is measured at the top of the eggs like this.
Ive never actually read the instructions myself but most say its best to throw them out the window.
Ive never actually read the instructions myself but most say its best to throw them out the window.