What do you use for the basking spot?

A total complete opposite for me and I thought something might be wrong but hey its been almost three years now and have a huge fattie and very healthy female. I have a custome built emclosure with built in UTH on one side the two hides and have timer controlled night and day lighting in canopy but I have never ever never seen my BP ever bask sit or even get close to the UTH it never has ventured to the other hide and stays in its normal hide cool side.

Yes I maintain perfect temps seasonlly and day night, I have tried to switch up the hide sides and locations every 6 months but no fooling her she does not want to go any where near the UTH and NO it is not to hot at all it is perfect UTH on therm.

I just gave up trying and worrying since she is healthy and happy for years now.

What are you using to control the temperature output on the uth and what do you use to measure the temp?