Something I told my tech students all the time. Some got it, and more power to them.
It's the concept of the 'Crap Meter'. It's a tool that lives in your head, and is calibrated daily all your life. It holds what you are looking at up to a meter which determines if it's total crap or not. The more crappy the data is, the more the meter goes BING BING BING.
It works like this. Lets say you have a car battery on charge. You use your DVOM to check the voltage at the terminals. You read 22 volts. Now, you know it needs to be over 12.5 or it won't charge at all. Is 22 volts higher than 12.5 volts? You betcha... BUT.... your crap meter should be blaring like a mariachi band in an elevator. 22 volts is CRAP. Either the DVOM is faulty or the charger is faulty and it's going to destroy the battery and/or the vehicle.
The principle of the Crap Meter can be applied to almost everything in life. That book that's marked as 72,000 pages in Amazon? Yeah... I'm going to call crap on that one. The sealed package that is supposed to be 20 pounds of bread flour but feels like an empty box? yeah... crap. The politician who swears he's not lying this time? Yup, BS and crap at the same time. The grocery order total that goes up by $10 after you add a $6 item that was supposed to be on sale? Yup... you got it. Crap.
Everyone comes with a Crap Meter in their head. Some people don't use theirs, or are selective on when it's applied. Other people run their whole life past that meter, all day and every day.
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