RAPT Pill Hydrometer & Thermometer - WiFi + Bluetooth Digital Hydrometer
Drop the RAPT Pill in your fermenter and watch gravity and temperature stream to your phone: live fermentation curves on the free RAPT portal, WiFi straight to the cloud, no base station needed. You see the moment fermentation starts, stalls or finishes — without ever cracking the lid.
This is the yellow-housing version with the 18650 battery included, pre-assembled and ready to float. It reads through PET and glass fermenters, pairs with the whole RAPT ecosystem (temperature chamber, heating pad, controllers) for closed-loop fermentation control, and recharges via the optional wireless charging kits — no opening, no re-sealing.
Honest note: like every floating hydrometer, kräusen can throw readings for a day or two at peak — trust the curve's shape, not a single data point.
Key features
- Gravity + temperature, live via WiFi & Bluetooth
- Free RAPT cloud portal with fermentation graphs
- 18650 battery included, yellow housing pre-assembled
- Works in PET, glass and stainless (with Bluetooth repeater)
- Part of the RAPT ecosystem — chambers, pads, controllers
Usage
- Calibrate in water (1.000) before the first batch
- Sanitise, drop it in, and set a RAPT alert for your target final gravity
- Spin it gently at high kräusen if readings wobble — CO2 bubbles cling to the housing
Quick facts
- Measures: SG + temperature
- Connectivity: WiFi & Bluetooth
- Battery: 18650, included
- Housing: yellow, pre-assembled
- SKU: KL20596
Related products
- RAPT Pill + Wireless Charging Bundle
- Wireless Charging Kit
- RAPT Fermentation Chamber
- Clear Housing (Bottom)
- Red Housing (Top)
- FermZilla 30L All Rounder Easy-Grip Kit