Sometimes, your sampled color may appear different compared to the sample surface. There are many reasons why this may occur.
Your Pico may not be calibrated properly.
The first step is to make sure you have successfully zeroed your Pico (follow the steps here). If you have the latest version of the iOS or Android app running, a zero status bar will indicate progress. Please only remove Pico from the rubber cap once fully complete.
You are comparing screen colors against physical colors
If you are visually comparing a sampled color on a screen to a physical sample, you must keep in mind that the color of a screen (through light emission) will never appear exactly the same as the color of a surface (through light absorption). This is true whether or not the screen has been calibrated.
The Pico App provide an approximation of the sampled color on a screen - this should not be used as an accurate indication of surface color.
To use your captured color, it's best to use the raw color values or palette matches.
You are scanning a surface which is hard to measure
Pico uses an internal light source and detector to read color, and this means some surfaces can't be captured very well.
For example, Pico doesn't perform optimally on surfaces which contain fluorescent inks (common in certain fabrics, post-it notes etc).
For a more comprehensive list of surfaces to avoid click here.