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Available in both digital and analogue versions, multimeters are electronic measurement tools that are much used in the field by operatives, as well as providing accurate readings in laboratories and workshops. Generally speaking, handheld multimeters are used by field engineers, while benchtop multimeters are used in dedicated test facilities. However, there is no reason why this approach cannot be reversed, if wanted. As well as modular measuring systems, a number of multimeters are made in kit form, which means that they are often supplied with carry cases and a variety of probes and sensors that enable the multimeter to gain accurate reading, no matter which mode it is in. Multimeters can make all sorts of measurements, including resistance, voltage, current, sound level, conductance, duty cycle, temperature and inductance, among others. Analogue multimeters use a microammeter within them to move a needle pointer to give readings. By contrast, digital multimeter devices use an LCD display to offer a numerical output. Digital products may also have a graphical function that is able to represent the measured value in the form of a chart or graph. Digital multimeters are now widely used due to their precision and reliability, but analogue multimeters are often still favoured when a rapidly varying value needs to be measured.