Bought a digital thermometer online, it was on sale for $15 with free shipping so why not.
Took about a month to arrive by Canada Post but it’s a good tool and fun too. Easy to check the accuracy by trying it on boiling water and an ice cube and it’s pretty good from about 4 to 6 inches away.
The UTH is keeping the bottom of the terrarium at 91F which is ideal. Tap water in this building comes out around 105F which is also great for warming up frozen rats to a toasty 100F so Mr Burrows has no trouble recognizing them.
The thermometer is already handy when baking.