If you need to make sure your scale is weighing as precisely as possible, follow these steps: • Make sure the scale is on a totally flat surface. • Wipe the surface of the scale with a wet sponge and then a dry paper towel to make sure there is absolutely no residue on it. • Turn the scale on and use the “tare” function to set it to zero. You can make sure the scale is weighing 100% accurately by setting the weight unit to grams and then putting a penny on the scale. If it weighs in at exactly 2.5 grams, the scale is correct. You can also use a nickel, which should weigh 5 grams. Remember that some coins have imperfections, so you may have to weigh two times if you’re slightly off the first time.