Turn on the scale
Press the “power” button for 0.5 seconds to turn on the scale.
You should see a brief screen of "cACAIA" (Pearl or Lunar) or “acaia” (Pearl S only) before it goes into a mode. If it's stuck on the loading screen, it means that it can't find a stable environment. Read more about why level surfaces are important.
Turn off the scale
Double tap the "power" button to turn off the scale.
If your Pearl's firmware is before 1.8390, press and hold the "power" button for 3 seconds to turn off the scale.
Learn how to update your scale to the newest firmware.