Businesses in the precision equipment category make, supply, install or maintain tools and instruments designed to measure, inspect or control work to close tolerances. Their products may include micrometers, callipers, gauges, coordinate measuring machines, optical comparators, precision scales, sensors and specialist fixtures. Equipment is used in manufacturing, engineering, laboratories and quality-control settings, where accurate and repeatable results are important. Services can include helping customers select equipment for a particular task, setting it up, providing operating guidance and carrying out repairs or routine maintenance. Some suppliers also arrange calibration, testing and certification, or offer equipment hire. The range varies from handheld measuring tools to automated inspection systems, and may cover new or refurbished items, accessories, software and replacement parts.