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I added a Tilt wireless hydrometer to my fermentation setup two years ago and it changed how I think about fermentation management. Before the Tilt, I took gravity samples every two days by opening the fermenter, each opening was an oxidation and contamination risk, and I was still guessing at the fermentation curve between samples. The Tilt floats in the fermenter and transmits gravity and temperature readings every few minutes via Bluetooth to a phone or Raspberry Pi logger, drawing a continuous fermentation curve without ever opening the fermenter. That data has helped me catch stuck fermentations earlier, time dry hop additions more precisely, and confirm attenuation without sampling. Here’s what IoT fermentation monitoring options exist and which are worth investing in.
Wireless floating hydrometers
Tilt Hydrometer ($130–150)
The Tilt is a color-coded Bluetooth floating hydrometer that measures gravity and temperature continuously. Eight colors available, each with a different gravity calibration range, buy one color and calibrate it to your specific unit with the included calibration solution. The companion app displays readings directly on an iPhone or Android phone. For extended range and continuous logging, a Raspberry Pi running TiltPi software logs readings to Google Sheets automatically, a permanent fermentation curve for every batch. Accuracy: ±0.002 SG and ±1°F. Sufficient for tracking fermentation progress and timing packaging, though not as accurate as a well-calibrated bench hydrometer for final gravity readings. Best use: monitoring fermentation activity in real-time without opening the fermenter.
Rapt Pill ($75–95)
The Rapt Pill is a lower-cost Bluetooth/wifi floating hydrometer that integrates with Brewfather Premium for real-time fermentation display within the recipe interface. Smaller form factor than the Tilt and includes wifi connectivity for longer range without a Raspberry Pi relay. Cloud logging is built-in, no additional setup for Google Sheets logging. Accuracy is comparable to the Tilt. The Brewfather integration is a significant advantage for brewers already on Brewfather Premium, fermentation data appears alongside the recipe with no additional app required. The best choice if you’re already paying for Brewfather Premium.
Temperature monitoring sensors
A wireless temperature monitor is the most cost-effective IoT addition to a fermentation setup. The Inkbird IBS-TH2 ($12–15 per sensor) uses Bluetooth to transmit temperature and humidity readings to a phone app and can trigger alerts if temperature goes outside a set range. For monitoring a fermentation chamber without opening it to check the temperature controller, a wireless sensor on the fermenter surface provides continuous remote visibility. Multiple sensors can be monitored simultaneously, useful for monitoring fermentation chamber temperature separately from fermenter temperature.
Complete IoT fermentation station setup
A complete connected fermentation station uses: Inkbird ITC-308 temperature controller (cooling and heating control), a Rapt Pill or Tilt wireless hydrometer (continuous gravity and temperature), and a Raspberry Pi running CraftBeerPi or similar brewing automation software to consolidate all sensor data and provide remote monitoring. CraftBeerPi ($0, open source) runs on a Raspberry Pi and displays temperature profiles, gravity curves, and controller status in a browser interface accessible from any device on your home network. Total hardware cost for this setup: $150–200 for the temperature controller, wireless hydrometer, and a Raspberry Pi 4. The result is commercial-grade fermentation monitoring at a fraction of professional brewing automation system costs.
Common Questions
Is a wireless hydrometer accurate enough to replace manual gravity readings?
For monitoring fermentation progress (is fermentation active? is gravity dropping? has it stalled?) wireless hydrometers are accurate enough to be fully reliable. For final gravity confirmation before packaging, particularly important for bottle-conditioned beers where a too-high FG can cause overcarbonation, always take a manual hydrometer or refractometer reading to confirm. Wireless hydrometers can read 0.002–0.004 SG high or low depending on calibration and the specific beer’s composition. Use the wireless hydrometer to tell you when fermentation has stabilized (gravity flat for 48 hours), then confirm the final reading manually before packaging. This combines the convenience of continuous monitoring with the accuracy of a calibrated instrument for the reading that matters most.
