Nope. Very common newbie mistake... A thermostat is what regulates the heat source, so that your snake doesn't get burned or cooked alive, depending on what heat source you got.
Something like this if you're currently on a budget:
https://www.amazon.com/MTPRTC-Contro...mostat+reptile
Or a herpstat, which is the best kind and will last you years or for most of the lifetime of the snake:
https://www.spyderrobotics.com/index...products_id=24
A temp gun is "aim at a spot and tells the temp".
A digital thermometer is what you place in the enclosure to get the ambient temp.
You need all of these things, but the thermostat is the #1 most important for the immediate safety of the animal.
Also, it really only takes following a good caresheet to get all the basics right. Just stick to this one and follow it to a T and make things easier: https://ball-pythons.net/forums/show...s%29-Caresheet