Hey! You might wanna get a laser thermometer at Home Depot. UVB doesn’t pass through screens, so you’ll have to cut a hole out or get a lamp stand and remove the screen. Also, that is way too small for a Russian. You want to have an enclosure that’s about 8x4. A bit smaller is okay, but anything smaller can be detrimental to their health. They need to walk around to digest their food and not gain weight and be happy.