I use the cheapest aquarium thermometers I can find. I buy more than I need and check them against each other and don't use the ones that read much differently from the others. The ambient one I really like the Fluckers dual thermometer and hygrometer one.
simplex, I get your point, but ambient room air temps have massive impact on the enclosures ambient air temps. The enclosure type also has quite large impact as well as type amount and placement of ventilation.
The thing few understand is why they are important. Snakes have a long lung and a short one. The short lung is mostly an aid to help respiration so it can be ignored for air temp discussions. The long lung runs past the heart liver and all the major arteries and veins. If the air temp in the lung is too cool it cools the lung blood (liver and circulation) and core temps. To try to warm the entirety of the animal with just surface temps is unlikely.
Surface temps do help to alter the air temps but your example of 69 the most I have ever seen ambient air temps lift by surface temps alone is 5º that would be 74º not enough or at the very least just barley.
Guessing husbandry is not a good idea. The fact most keepers whom have tons of experience usually heat a 'snake' room to high ambient temps and have little experience with cool room temps. My situation makes this impossible it is simply too costly.
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