From the product description, check product page for current description, price and availability:

Designed for stainless steel fermenting vessels and kegs, the Tilt repeater can be placed inside a refrigerator along with a keg or fermenter and extends the range of your Tilt hydrometer so it can reach more distant locations where you might have a tablet, phone, or Tilt Pi plugged in for continuous automatic logging solutions. The Repeater can repeat the signal from one Tilt at a time as long as its signal is strong enough. It is waterproof and has a 6 month battery life with the included USB-micro rechargeable li-ion battery. The Repeater updates at least once every 2 minutes.

Instructions for use are as follows:

1. Unscrew caps on each end the plastic enclosure. Gently push out electronics assembly.
2. Using the color key located on the battery holder, press the button repeatedly to select the desired Tilt hydrometer color to repeat. For example press the button once to repeat a red Tilt or twice to repeat a green Tilt. To turn the repeater off, press the button repeatedly until the LED blinks red.
3. Confirm desired color selected by opening the Tilt app and verifying selected color shows an initial specific gravity of 0.000 and temperature of 0°F (-17.8°C). Once the repeater connects (indicated by periodic green LED flash) it will show the actual repeated values.
4. Return assembly to tube and screw caps back on. Place repeater as close as possible to Tilt hydrometer (but still outside fermentor) and verify green LED flashes indicating a connection.

From the product description, check product page for current description, price and availability:

Designed for stainless steel fermenting vessels and kegs, the Tilt repeater can be placed inside a refrigerator along with a keg or fermenter and extends the range of your Tilt hydrometer so it can reach more distant locations where you might have a tablet, phone, or Tilt Pi plugged in for continuous automatic logging solutions. The Repeater can repeat the signal from one Tilt at a time as long as its signal is strong enough. It is waterproof and has a 6 month battery life with the included USB-micro rechargeable li-ion battery. The Repeater updates at least once every 2 minutes.

Instructions for use are as follows:

1. Unscrew caps on each end the plastic enclosure. Gently push out electronics assembly.
2. Using the color key located on the battery holder, press the button repeatedly to select the desired Tilt hydrometer color to repeat. For example press the button once to repeat a red Tilt or twice to repeat a green Tilt. To turn the repeater off, press the button repeatedly until the LED blinks red.
3. Confirm desired color selected by opening the Tilt app and verifying selected color shows an initial specific gravity of 0.000 and temperature of 0°F (-17.8°C). Once the repeater connects (indicated by periodic green LED flash) it will show the actual repeated values.
4. Return assembly to tube and screw caps back on. Place repeater as close as possible to Tilt hydrometer (but still outside fermentor) and verify green LED flashes indicating a connection.