Quartz Thermochromic Banger - 90 Degrees
No need for a dab timer or guesstimation!
The thermochromic frit within this banger changes from yellow to orange once it has reached the optimal temperature for concentrates. If it turns red, it's too hot - just wait for it to turn back to orange before you start.
The two glass walls also hold heat like a Thermos, keeping the banger at the proper temperature longer.