Altimeter It measures altitudes and is used in aircrafts. Ammeter It measures strength of electric current (in ampere). Anemometer It measures force and velocity of wind. Audiometer It measures intensity of sound. Audiophone It is used for improving imperfect sense of hearing, Barometer It measures atmospheric pressure. Binocular It is used to view distant objects. Dynamo It converts mechanical energy into electrical energy. Fathometer It measures the depth of the ocean. Hydrometer It measures the specific gravity of liquids. Hygrometer It measures humidity in air. Lactometer It determines the purity of milk. Microscope It is used to obtain magnified view of small objects. Periscope It is used to view objects above sea level (used in sub-marines). Pyrometer It measures very high temperature. delsity
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