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Periscope
A periscope is used to observe the surface from a submarine
PERISCOPE
The medical term for an instrument used to view small objects is "microscope." It is commonly used in various medical fields for examining cells, tissues, or microorganisms at a magnified level.
Binocular
Periscope.
A telescope or binoculars.
telescope
sonar is a device used underwater for locating submerged objects and for submarine communication by means of sound waves.
How to find out the calculation for dry calibration of a level instrument used on the top of the tank? How to calibrate level instrument with the help of weights?
This instrument is called pH-meter.
A microscope