Which hand tools are used to measure accurately?

Several hand tools are specifically designed to provide high-precision measurements in scientific, manufacturing, and construction contexts:

• Vernier Caliper: This instrument features a main scale and an auxiliary sliding vernier scale. It allows for highly accurate linear measurements by enabling readings to a fraction of a main-scale division.1
• Micrometer: Used for precise linear measurements of diameters, lengths, and thicknesses, this tool utilizes a C-shaped frame and a screw-operated movable jaw. Its accuracy is determined by the precision of the screw-nut combination.2
• Caliper: While basic calipers are used for transferring or measuring small distances, they are essential for determining the diameter of cylindrical or spherical bodies.3
• Square: These devices, such as the precision steel square or the combination square set, are used to verify right angles, guide cuts, or locate holes with accuracy.4
• Divider: Featuring two sharp points, this tool is used for marking distances or dividing a given length.3
• Depth Gauge: This tool is specifically designed to measure the depth of grooves, holes, or other concavities.5