> For the complete documentation index, see [llms.txt](https://docs.rapt.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.rapt.io/equipment/rapt-pill-hydrometer-or-user-guide.md).

# RAPT Pill Hydrometer | User Guide

KL20596 RAPT Pill Hydrometer & Thermometer | User Guide

The RAPT Pill Hydrometer and Thermometer allows accurate, real time temperature and gravity logging during fermentation over either WiFi or (with a Bluetooth capable RAPT device) over Bluetooth.

When integrated with a RAPT device such as a RAPT Fermentation Chamber, the RAPT Pill can be used as a probe that controls your fermentation. 

This opens up a whole world of possibilities! You can use gravity or even gravity velocity as a trigger for temperature increases. No more guessing when its time to do a diacetyl rest - simply set your RAPT device to ramp up the temperature when the gravity change starts to slow down!

With a easy to clean form factor and a powerful 18650 Li-ion battery, these can last for months between charges.

We highly recommend the [wireless charging kit](https://kegland.com.au/products/wireless-charging-kit-for-rapt-pill-hydrometer) for the Pill, or a complete [Wireless Charging RAPT Pill Hydrometer & Thermometer](https://kegland.com.au/products/wirelessly-charged-rapt-pill-hydrometer-thermometer-red-housing-pre-assembled) can be purchased.

Need more then one Pill! Easy! Grab the colour of your choice - choose either the [<mark style="color:red;">Red Pill</mark>](https://kegland.com.au/products/red-rapt-pill-hydrometer-thermometer-wifi-bluetooth), [<mark style="color:blue;">Blue Pill</mark>](https://kegland.com.au/products/blue-rapt-pill-hydrometer-thermometer-wifi-bluetooth) <mark style="color:blue;">or</mark> [<mark style="color:green;">Green PIll</mark>](https://kegland.com.au/products/green-rapt-pill-hydrometer-thermometer-wifi-bluetooth)

Before using the RAPT Pill Hydrometer & Thermometer for the first time, it needs to be fully charged, updated and registered to the **RAPT Brew App**.

To download the RAPT Brew App use these links:

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<p align="center"><a href="https://apps.apple.com/au/app/rapt-brew/id6754349453"><strong>RAPT Brew on the App Store</strong></a></p>
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<figure><img src="https://570278281-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FUqN4sW0x2s4yh6iiT8NN%2Fuploads%2FFHXofkNOKDiKOZz4fMOw%2FPlay%20Store%20Badge%20Button.png?alt=media&amp;token=c72e0b14-e001-458e-b6cf-cc70d84a2901" alt="" width="359"><figcaption></figcaption></figure>

<p align="center"><a href="https://play.google.com/store/apps/details?id=io.rapt.app&#x26;pcampaignid=web_share"><strong>RAPT Brew on the Play Store</strong></a></p>
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