Vernier calipers are measuring tools used to obtain precise measurements of an object's dimensions. They come in various sizes and shapes, but they all serve to measure length, diameter, thickness and depth. Some synonyms for vernier caliper include precision caliper, dial caliper, digital caliper, micrometer caliper, and depth gauge. Precision calipers are used in industrial and engineering applications to provide high levels of accuracy, while dial calipers use a rotating dial to help with precision measuring. Digital calipers are electronic tools that provide precise measurements on a digital display, while micrometer calipers are used to measure precise small distances. Lastly, depth gauges are used to measure the depth of holes and cavities.