Wireless digital hydrometer & thermometer — logs gravity and temperature live over WiFi or Bluetooth.
The RAPT Pill floats in your fermenter and streams specific gravity and temperature to the free RAPT app (app.rapt.io) over WiFi or Bluetooth. The robust, sanitary capsule opens easily for USB-C charging, and its shape is designed so krausen and hops are less likely to cling and skew the reading. (Charging cable not included.)
Key points
- Live gravity + temperature — follow fermentation from your phone or the web portal.
- WiFi or Bluetooth; free RAPT app on Android / iOS.
- USB-C charging; the control unit lifts right out of the capsule.
- Sealed, food-grade build — BPA-free Nylon 12 & POK, chemically resistant and robust.
Specifications
| Connectivity | 2.4 GHz WiFi / Bluetooth |
| Charging | USB-C (cable not included) |
| Battery life | ~1 year at 1 reading/hour; ~5 months at 15-min intervals |
| Housing | Food-grade Nylon 12 & POK, BPA-free |
Setup: charge for ~24 h before first use to calibrate the battery; firmware updates download over USB-C / WiFi. Online features need a 2.4 GHz WiFi network.
Pair with a RAPT Temperature Controller · Browse Fermenting.