A set of calipers.
A micrometer is a common instrument used to measure the external and internal diameter of a test tube. It is a precision tool that provides accurate measurements of small distances. Another option is a caliper, which can also be used for measuring diameters.
The instrument commonly used to measure the external diameter of a glass rod is a caliper, specifically a vernier caliper or a digital caliper. These tools allow for precise measurements by fitting around the rod and providing a reading on a scale or digital display. For larger diameters, an inside micrometer or a dial gauge can also be used.
Vernier caliper
Calipers measure the internal or external dimensions of something.
A manometer instrument is used to check the alignment of two shafts.
A caliper can be used to measure the internal and external diameter of a tube with about a 5cm bore. Make sure to use the appropriate jaws of the caliper for accurate measurements. Alternatively, a micrometer can also be used for precise measurements of the tube's diameter.
The instrument used to measure the diameter of spherical objects is called calipers.
A Vernier caliper, or a micrometer can measure diameter real well, and from that it's easy to calculate area.
A vernier caliper or a micrometer can be used to measure the internal diameter of a beaker. These tools provide accurate measurements of dimensions, including internal diameters, with precision.
A digital caliper is commonly used to measure the internal and external diameters of a test tube with precision. This tool allows for accurate readings by using its jaws to measure diameters and display the measurements digitally.
Astronomers use a variety of instruments such as telescopes and radar to measure the diameter of planets. One commonly used instrument is a laser range finder, which can be used to determine the size of a planet by measuring the time it takes for a laser beam to bounce back to Earth after being pointed at the planet's surface.
The jaws of the vernier calipers are used to measure the external diameter of a cylinder. The jaws are placed around the object being measured, and the reading is taken from the scale on the main body of the calipers.