Step 1
Clean the scale to remove any debris or other objects that may affect the weight.
Step 2
Set the scale on a level surface. Measure with a bubble level if you are unsure of the proper level. Place the bubble level on the scale with the center bubble in the center of the scale. The bubble should be equally between the two marks on the glass.
Step 3
Remove any other electronic equipment that may interfere with a digital scale.
Step 4
Set the scale to zero using the instructions for your model.
Step 5
Set the scale to read grams instead of ounces.
Step 6
Place the penny on the scale. It should read exactly 2.500 grams.
Step 7
Use the calibration button as the manual instructs to adjust the scale if the weight is off on the first penny. Weigh the nickel to see if it is 5.000 grams. If the nickel is correct, then continue to weigh the rest of the coins. If the calibration was done correctly on the first penny, and the scale is working properly, each coin should be correctly weighed. If only one coin is off-weight in the group then replace it with another coin in the same denomination. If the weight is correct this will tell you the first test coin was flawed and the scale is working properly.