Hello Morpheusda. I am sure once you do the calibration the actual probe will be accurate.
When you say "not correct" in reference to what? I think it's important to understand the placement of the probe. The probe on the BrewZilla is down the bottom of the BrewZilla and the temperature here I am quite sure will be accurate if you have done the calibration. With that said with all breweries you will get different temperature readings if you take measurements from other parts of the brewery. All breweries have a differential at the top, middle and bottom and in the core of the malt pipe. If you recirculate for long enough and also insulate the boiler you will find the temperatures get closer and closer together. With that said one of the major improvements to the Gen 4 was bluetooth and the ability to pair up to 8 bluetooth devices.
If you really want to achieve the best control I highly recommend using the
bluetooth probe that gives you a secondary probe so you can force the brewery to heat up the core of the malt pipe to the desired temperature and get to this point faster. This was covered in this video here:
You can definitely use the brewery fine without the bluetooth probe but once you use the probe I am confident you will see the value in this.
We are also looking to change the firwmware in the future so that you can put the bluetooth probe into the output of your counter flow chiller for instance and then control the pump speed to target a specific output temperature of the brewery so it will be useful for other applications like this. The same probe will also be useful in some of our new distillation devices where multiple temperature reedings are also necessary.