Nope feeding inside the tank is just fine. Almost everyone on here does it and most will agree that moving it from one enclosure to another just stresses it out. I've never had an issue with feeding in tank. It's just a myth that goes around and it's something pet stores tell a lot of people to do. It's not necessary. Also the temp gun is great but if you bought the thermometer it's a lot easier to just look at the unit to tell the temps and humidity instead of pulling out the temp gun. I just walk to my rack and check the units and see if everything is okay. Takes a few seconds compared to breaking out the temp gun, opening the enclosures and checking everything. They are nice and I use a temp gun but the thermometer just makes things a little easier.
The thermometer measures humidity too. You don't need a humidity gauge for each side of the enclosure. The humidity is basically the same throughout the whole enclosure. If you are having problems with humidity cover 3/4ths of your screen lid with a wet towel or foil to keep humidity in. But yeah the probe thermometers are great. You just put them in place and that's that. Only $12 too.