thermometer

EDIT: I have read your advice and have upgraded his lighting :) Check out my update post below! Hi all! I just purchased a Thrive 2-in-1 digital thermometer/hygrometer for my bearded dragon habitat. I’m mainly trying to find out if the basking lamp is hot enough for him in his favorite spot...

I have been trying to set up the new enclosure and I am struggling with the ambient temperatures and measuring them correctly. I am also getting a lot of different information all around and it's slowly driving me insane. The vivarium is a wooden 4 x 2 x 2, heating is a 150W Arcadia floodlight...