Point finder or "shop" book?

Hi guys
What is more precise and what do you use to work out your points?
The point finder or the " shop " book?
Answers would be great thanks as I'm a bit confused as I looked up a chicken and mushroom pot noodle and in the point finder it says like 7 and in the shop book it says 2?
Thank you :)
 
I use my calculator pretty much all the time, I have a shopping guide which is handy for general things but youre better relying on your calculator
 
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