color checking

Since I knew the importance of values my paintings has drastically improved. 
However, there is just one thing I don't understand and that is exactly how you guys color check. 
The way I do it is to make sure I tilt the palette knife at the exact same angle on the exact same distance to the object everytime I check a color, because if i just tilt it a little different the value will change.
Is this really how it is done?

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