| Galvanometer | An instrument for measuring electric current |
| Gaussmeter | A device that measures the magnetic flux. |
| Geiger Counter | A device that measures the radiation. |
| Goniometer | A device that measures the gravtional field. |
| Hydrometer | An instrument for measuring sound under water. |
| Hydrophone | An instrument for measuring the relative density of liquids. |
| Hygrometer | An instrument for measuring the relative humidity of atmosphere. |
| Hygroscope | An instrument to show the changes in atmospheric humidity. |
| Hypsometer | A device that measures the wavelength of light. |
| Inferometer | A device that measures the wavelength of light. |
| Lactometer | A device that measures the relative density of milk. |
| Machmeter | A device that measures the speeds at and beyond the speed of sound. |
| Magnetometer | An instrument used to compare the magnetic moments and fields. |
| Manometer | An instrument to measure the pressure of gases. |
| Mariner's Compass | An apparatus for finding direction. |
| Micrometer | An instrument used for measuring small distances or angles. |
| Microscope | An instrument for magnified view of very small objects. |
| Optometer | An instrument that detects the refraction of eye. |
| Otoscope | An instrument for examining the eardrum. |
| Periscope | An apparatus for viewing objects lying above the eye level of the observer whose vision is obstructed |
| Photometer | An instrument for comparing the luminous intensity of the sources of light. |
| Piezometer | An instrument for measuring high pressure. |
| Planimeter | An instrument for measuring the surface area of plane figure. |
| Plantimeter | A mechnical integrating instrument to measure area of a plane surface. |
| Pluviometer | An instrument for measuring rainfall. |
| Pyknometer | An instrument used to measure the density and coefficient of expansion of liquid. |
| Pyrheliometer | An instrument for measuring solar radiation. |
| Pyrometers | Thermometers to measure high temperature. |
| Quadrant | An instrument for measuring altitudes, angles in navigation and astronomy |
| Quartz Clock | A highly accurate clock used in astronomical observations and other precision work. |
| Radio Micrometer | An instrument for measuring heat radiations. |
| Rain gauge | An instrument for measuring rainfall. |
| Refractometer | An instrument used to measure the refractive index of a substance. |
| Resistance Thermometer | Used for finding the electrical resistance of conductors. |
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