# RAPT Bluetooth Thermometer | User Guide

This low energy RAPT enabled Bluetooth Thermometer is compatible with the Gen 4 BrewZillas, RAPT Temperature Controllers and RAPT Fermentation Chambers

The RAPT Bluetooth Thermometer is compatible with Gen 4 BrewZilla’s, RAPT Temperature Controllers and RAPT Fermentation Chambers allowing you to make smarter and more automated decisions on how to control the brewing or distillation process. The RAPT Bluetooth Thermometer is able to perform many functions when bonded with a RAPT controller including, but not limited to:

* Measuring core grain temperature of your BrewZilla to more accurately control the heating elements according to the mash temperature
* Measuring still head temperature and controlling the BrewZilla to turn the elements off once your target temperature is hit and your distillation run is over
* Measuring core fermentation temperature and controlling your RAPT Fermentation Chamber or RAPT Temperature Controller heating and cooling

**The RAPT Bluetooth Thermometer will not work without one or more of the devices listed above.**

<figure><img src="/files/XKSsnK4v0PFq5Qfx9oZu" alt=""><figcaption></figcaption></figure>


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.rapt.io/equipment/rapt-bluetooth-thermometer-or-user-guide.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.