It's just taped to the golf/fake/round object with the probe end sticking out from the "round object" that sits in one of the egg turner spots somewhere under the controller area.. That puts it just about 3/4 of the way up on a large egg...you can gently bend the probe end (NOT at the very end! or for less then 3/4" or so from the end tip) up to the top height of an egg..or leave it in the middle...or put it up against an egg if you wanted.<----But I prefer it measuring the surrounding air temp and not an egg temp cuz hatched "dried off" baby chickens run at 103+ or so for a body temp at about hatching age. Which WILL force a cool down of the air/incubator heater and the rest of the unhatched eggs will find it rougher to hatch...probably. So...don't let a newly hatched baby roost on the temp probe end,,,,or close to it. Maybe not even let it touch an almost to hatch egg since they run at 102+ degrees at the shell surfaces.