RAPT Pill Hydrometer & Thermometer

The RAPT Pill is a smart, wireless hydrometer and thermometer that gives you real-time gravity and temperature logging during fermentation. Connect via WiFi or Bluetooth and monitor everything through the RAPT app (iOS & Android), the RAPT IoT Hub (desktop), or directly via your RAPT Fermentation Chamber / Temperature Controller.

Perfect for carboys, Cornelius kegs, stainless fermenters, and pressurisable vessels.

 

Live Gravity & Temperature Tracking

• True real-time SG & temperature readings
• Automatic logging to the cloud
• View fermentation curves from anywhere
• Works with RAPT mobile app & IoT web portal

Hygienic & Durable Housing

Made from BPA-free Nylon 12 and Polyketone (POK):

• Food-safe, FDA-approved
• No bisphenols, plasticisers, or phthalates
• High chemical & temperature resistance
• Robust and long-lasting

Sanitary engineering:

• Splits at the midline for easy access
• No exposed threads
• Double O-ring watertight seal
• Larger body = less affected by krausen, hops, CO₂ bubbles (better accuracy)

Exceptional Battery Life

• WiFi mode: 2–5 months
• Bluetooth-only mode: 2+ years
• USB-C charging port on board
• Includes Li-Ion 18650 (EVE brand) battery

Telemetry battery life:

• 60 min interval: ~1.5 years
• 30 min interval: ~9.5 months
• 15 min interval: ~5 months

(Default telemetry = 60 min)

Bluetooth Bridge Mode (Recommended)

Using a RAPT Fermentation Chamber or RAPT Temperature Controller unlocks:

• Far better penetration through fridges & stainless
• Lower power usage = longer battery life
• More accurate core temperature readings
• Gravity-based automation & fermentation control

Important

Charge the Pill for 24 hours before first use to fully calibrate the battery.
Firmware updates install automatically when connected via WiFi + USB-C.

Customisable

Additional coloured housings sold separately:
Red • Blue • Green • Transparent
(Shipped with Yellow pre-installed)

For hassle-free charging, upgrade to the Wireless Charging RAPT Pill version.

What Is RAPT?

RAPT is a free cloud platform that:

• Stores your fermentation data
• Allows remote monitoring & control
• Enables automated temperature profiles
• Sends email alerts
• Supports unlimited devices

Specifications

• Accuracy: ±0.002 SG
• Temperature accuracy: ±0.2°C (0.36°F)
• Temperature range: –20°C to 60°C
• Pressure rating: 0–5 bar
• Battery: Li-Ion 18650 (included)
• Dimensions: 37 mm Ø × 125 mm
  

Tip: Accuracy can be affected if krausen or hop debris sticks to the housing — gently swirling the fermenter helps clear it.