Personal scales can be divided into two broad categories: analogue and digital. Analogue scales are the traditional means of measuring weight. It uses springs to measure a person's weight, is mechanical and does not require a power source. Analogue scales provide easy reading and are simple to calibrate. Its digital counterpart has an LCD screen display, which makes it easy to read the results and shows decimals accurately. Digital scales are extremely easy to use and the latest models are equipped with advanced technology and smart sensors. They can store previous readings and even take multiple measurements, such as body mass index (BMI).