Many different businesses have to use scales to keep track of their inventory. However, there are lots of other instances that require the use of scale. For example, doctor's offices use scales to monitor their patients weights, especially in a pediatric setting. Construction companies need scales to measure large quantities of building materials like concrete. Commercial fishermen have to weigh their catches at the end of the day. Scientists working with chemicals and pharmaceutical drugs have to get precise quantities of substances that may be difficult to gauge. Powdery substances are especially problematic in this instance. Jewelers must decipher weights for tiny objects, so they need small handheld scales. Companies that do a lot of international trading have to get exact measurements in order to legally conduct business transactions. Airports must purchase luggage scales for checked baggage. Businesses that ship small items have to buy scales, too. Restaurants, fast food outlets in particular, often weigh food items for the purpose of consistency. Clearly, scales are used for more than just bathroom decoration. Retail scales may be digital or non-digital. Industry insiders will recognize the terms electronic and mechanical. Almost everyone uses electronic scales, which are digital. Medical offices usually don't use electronic scales. They have to use mechanical scales because these are outfitted to also measure height. Some scales are calibrates to make sure that do not lose their accuracy over time whereas others are not calibrated at all.