Gauge block.
Calibrating micrometers: For quick reference the supplied test piece can be used. For calibrating a micrometer, gauge blocks are used.
Stage micrometer is a glass slide with a scale of known divisions used to calibrate the eyepiece micrometer. Ocular micrometer is a specialized eyepiece with a built-in scale used to measure the size of objects viewed under a microscope. They both help determine the magnification and size of objects but are used at different stages in the setup process.
a tiny ruler that you know the measurements of, and you use it to calibrate the ocular lens of a microscope
caliper. Micrometer
A stage micrometer is used in microscopy to calibrate the eyepiece reticle or camera system. It provides a known distance for calibration, allowing accurate measurement of objects viewed under the microscope.
(the metric unit) The average bacteria is only about a micrometer in length, so there may be thousands in a single drop of water. (the tool) He used a micrometer to measure the thickness of the circuit board.
I seem to have misplaced my favorite micrometer. Since the mircometer was impossible to see with the naked eye, it was put under the microscope for further inspection.
A Mitutoy micrometer is a name brand microwave that has micrometer waves. Micrometers microwaves are claimed to be able to cook foods more evenly then traditional microwaves.
You could use a simple ruler, or a micrometer for greater accuracy.
I've used them for many years and never heard of another name.
Calibrating an inside micrometer is more difficult because it requires access to the inside diameter of a cylinder or hole, which may not be easily achievable compared to the outer surface where an outside micrometer is used. Additionally, inside micrometers are more sensitive to temperature changes and require specialized procedures for accurate calibration.
Ocular micrometers are see-through disks with a ruler in them that go in the eypiece of a microscope to measure what you are seeing. Stage micrometers are put on the stage/view platform of the microscope, so instead of putting them in the eyepiece you are putting them right next to the object you are looking at in the microscope.