Lying electronics because "lying to the children".
My oven lies. If you set it to 200C and watch it preheat, as it gets to about 195C it will jump to 200C and lock there. While you have 200C set it will report to be 200C.
Of course it's not 200C. Shortly after it past 195, 196... it continued to climb all the way past 200C to about 205/206C before the residual heat in the elements ran out. It will then cool over the next 10 minutes or so to 195C again before the elements kick back in. While they warm up it may fall even further.
Why does it always say 200C then?
Because otherwise the manufacturer and sales organization drowns in unfounded complaints. No sensible person
likes that kind of lying, but try designing a product and putting it in market, and soon you will start understanding and feeling sorry for the designers who have to put time in designing various lie-to-customer algorithms, and as side effect, make products worse for everyone else.
And don’t get me started on digital kitchen scales… She would put something on the scales and it might show 326 grams, take it off then put it back on again and it might show 325 grams.
This is exactly why some digital scales (for weighing human beings) store some latest values in internal non-volatile memory and round any new measurement close enough to some of the previous numbers. This alleviates the neurosis some people have over their weight and small changes thereof, so it's beneficial to the users. Except those who try to use the scales for purposes they are not designed for, e.g. weighing some objects.
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