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With my one, you press the button on and then put it under ( a dry) armpit. ( not over clothes, on the bare skin). Leave there for a couple of minutes, until it beeps. Then it will give you your reading. it can also go under the tongue but have never tried that!
With that thermometer the only way to measure core body temp is up the bum...which you shouldn't actually do with that style.
Best use of that style of thermometer is in the armpit, and then add 0.5C (for armpit).
TBH the truely best way is to take a few measurements in whichever orrifice you chose over a few days and use that as a baseline. Doesn't matter if they are all different. You just neeed to know when it changes IYSWIM.