a display unit that indicates the condition of an apparatus
an instrument used for measuring, called stadimeter
a survey to measure the height of tides
an instrument used to measure mechanical power, called a fan dynamometer
an apparatus used to measure microscopic lengths, called comparator
an instrument used to measure the altitudes of heavenly bodies, called quadrant
a telescope which is used for leveling called a leveling instrument
a device to measure the condition of a muscle, called a dynamograph
a place used to observe the weather