No Way To Work Without Temperature Meter

Absolutely no way to work in hacked temperature meter scenario. I cannot trust it's readings. It will require a lot of calculations to arrive at the right heat equations and estimate temperature inside the kiln. Without all this, I have to rely on the temperature meter. 

Temperature meter reduces my budget. Else will need to hire someone to do all the calculations. 

The temperature turns back from 592. 59 is game number. Anyways with charcoal burning inside, the temperature should increase more.