From the product description, check product page for current description, price and availability:

If you have a RAPT device, you know how handy it would be if you could have temperature data input into your RAPT control profiles. This RAPT enabled Bluetooth Thermometer is compatible with the Gen 4 BrewZillas and RAPT Temperature Controllers and RAPT Fermentation Chambers.

For example, by receiving multiple thermometer sensors the BrewZilla can make smarter and more automated decisions on how to control the brewing or distillation process. A thermometer can be placed into your coolant water so you get an alarm if the temperature is too high, another can be put into the middle of the malt pipe so you can more accurately control elements switching on/off to achieve a core malt pipe temperature, and more.

The RAPT Bluetooth thermometer will connect to your BrewZilla Gen 4, RAPT Temperature Controller, or RAPT Fermentation Chamber and log temperature data and manipulate fermentation/brewing and distillation profiles in the RAPT Portal (https://app.rapt.io/).

This greatly reduces the need for handwritten records of your brew day as it’s all logged automatically. The RAPT portal also allows you to see every brew you have done in the past with logged temperatures from the main units probe and this bluetooth thermometer. In addition, this unit can also be setup to get push notifications to your mobile phone of when to sparge.

With the Brewzilla Gen 4, this thermometer will allow you to fully customize your brew day with profiles specifically tuned to your style of brewing or your recipe. For example, you could set up step mash profiles using the core temperature of your mash instead of the cavity below where the probe is.

Features a 7.5” probe, 40” cable, magnetized backing plate, and runs on two AAA batteries.

Note: This will not work on its own, so do not buy this unless you also have a Brewzilla Gen 4, RAPT Fermentation Chamber, or RAPT Temperature Controller.