| Instrument | Uses |
| Altimeter | It measures altitudes and is used in aircrafts. |
| Ammeter | It measures strength of electric current. |
| 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. |
| Radar | It is used for detecting the direction and range of an approaching plane by means of radio microwaves. |
| Seismograph | It measures the intensity of earthquake shocks. |
| Stethoscope | Used to hear and analyse heart and lungs sound. |
| Telescope | It views distant objects in space. |
| Thermometer | Used for the measurement of human body temperature. |
| Voltmeter | It measures the electric potential difference between two points. |
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