In some scales there are both tare and zero buttons, what happens when one press either, and which one is advisable to use on daily operation, not in calibrating. please advice
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When You have nothing on the scale, press zero button. This allows the scale to make correction of errors (caused by temperature changes, humidity, supply voltage, dust on scale, drift of zero with time...)
When You have empty container, box,..something to contain what You really want to weight, press tare button. Scale will write displayed weight (of container) to internal memory, and will subtract this value from results of next weighting. This allows to know netto weight of this, what You will put to container, without using calculator.
Not calibration. Just zero-ing (if there is such a word ).
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"Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856