Can a digital scale be wrong?

Sure, the human body fluctuates over the course of the day and there are some crappy scales out there, but even relatively good scales can seem to be wildly inaccurate. In general, digital bathroom scales are more accurate than mechanical ones. Dhuʻl-H. 25, 1439 AH

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Then, how do you calibrate a digital thermometer?

How do you calibrate a digital scale with coins? Place your chosen coin on the scale and read the output. If you placed a penny on the scale, you should read 2.500 grams. If you place a quarter on the scale, the output should read 5.670 grams. If the scale read 5.671 grams, clearly there is a 0.001 gram difference in the reading and the known mass.

How do you calibrate a small digital scale?

Calibration 101 Press ON/OFF to turn the scale on, and wait for the scale to stabilize, where it reads 0.0g. Press and hold the MODE key, the middle button that says “M”, until the display reads “CAL”. Take one more look at the platform to make sure it is totally bare. Subsequently, how is calibration performed? A calibration professional performs calibration by using a calibrated reference standard of known uncertainty (by virtue of the calibration traceability pyramid) to compare with a device under test. He or she records the readings from the device under test and compares them to the readings from the reference source.

You can also ask what is calibration and how it is done?

Calibration is the process of configuring an instrument to provide a result for a sample within an acceptable range. The instrument can then provide more accurate results when samples of unknown values are tested in the normal usage of the product.