How To Calibrate A Scale At Home. For some machines, you need to press the button a little longer to enter into the calibration mode. On the lower corner of your scale, there is an option of kg and lbs.
Start with zeroing the instrument without any load. Press and hold the mode key, the middle button that says “m”, until the display reads “cal”. If it doesn't, try it again and see if it is off by the same number.
Set the scale to read grams instead of ounces.
Set the scale to read grams instead of ounces. Weighing scales are widely available in all homes. Furthermore, to properly calibrate the scale in this example, the calibration technician should be using a mass standard with an accuracy tolerance of at least ±0.3125 grams. If the reading is correct, then the calibration was successful.