| Instrument | Use |
| Electro microscope | To obtain a magnifying view of very small objects Capable of magnifying up to 20,000 times |
| Endoscope | To examine internal parts of the body |
| Fathometer | Measures depth of the ocean |
| Fiuxmeter | Measures magnetic flux |
| Galvanometer | Measures electric current |
| Hydrometer | Measures the relative density of liquids |
| Hygrometer | Measures level of humidity |
| Hydrophone | Measures sound under water |
| Hygroscope | Shows the changes in atmospheric humidity |
| Hypsometer | To determine boiling point of liquids |
| Lactometer | Measures the relative density of milk to determine purity |
| Machmeter | Determines the speed of an aircraft in terms of the speed of sound |
| Magnetometer | Compares magnetic moments of magnets and fields |
| Manometer | Measures the pressure of gases |
| Micrometer | Measures distances/angles |
| Aerophone | Converts sound waves into electrical vibrations |
| Microscope | To obtain a magnified view of small objects |
| Nephetometer | Measures the scattering of light by particles suspended in a liquid |
| Ohmmeter | To measure electrical resistance in ohms |
| Ondometer | Measures the frequency of electromagnetic waves, especially in the radio-frequency band |
| Periscope | To view objects above sea level (used in submarines) |
| Photometer | Compares the luminous intensity of the source of light |
| Polygraph | Instrument that simultaneously records changes in physiological processes such as heartbeat, blood-pressure and respiration; used as a lie detector |
| Pyknometer | Determines the density and coefficient of expansion of liquids |
| Pyrheliometer | Measures components of solar radiation |
| Pyrometer | Measures very high temperature |
| Quadrant | Measures altitudes and angles in navigation and astronomy |
| Radar | To detect the direction and range of an approaching aeroplane by means of radiowaves, (Radio, Angle, Detection and Range) |
| Radio micrometer | Measures heat radiation |
| Refractometer | Measures refractive indices |
| Salinometer | Determines salinity of solutions |