| Actinometer | Measures the intensity of light |
| Altimeter | Special type of aneroid barometer, used in measuring altitudes |
| Ammeter | Measure the strength of an electric current |
| Anemometer | Measure the velocity and find the direction of the wind |
| Aspirator | An apparatus used for removing liquids from body cavity |
| Audiometer | Measure difference in hearing |
| Barograph | An aneroid barometer used to monitor pressure |
| Barometer | Measures atmospheric pressure |
| Beaufort scale | Measures wind force |
| Binocular | Optical instrument designed for magnified view of distant objects |
| Bolometer | Measures heat radiation |
| Calorimeter | Measures quantities of heat |
| Chronometer | Clock to determine longitude of a vessel of sea |
| Colorimeter | Compares intensities of colour |
| Crescograph | Records electrically the response of living matter to various kinds of stimuli. |
| Dynamo | Converts mechanical energy into electrical energy |
| Electroscope | Detects the presence of electric charge |
| Fathometer: | Measures depth of the ocean |
| Galvanometer | Measures electric current |
| Hydrometer | Measures the relative density of liquids |
| Hydrophone | Measures sound under water |
| Hygrometer | Measures the relative humidity of the atmosphere |
| Hygroscope | Shows changes in atmospheric humidity |
| Kymograph | It graphically records physiological movements (Blood pressure and heart beat). |
| Lactometer | Measures the relative density of milk |
| Lactometer | Measures the relative density of milk |
| Magnetometer | Measures the strength and direction of magnetic fields |
| Manometer | Measures the pressure of gases |
| Micrometer | Measures accurately small distances or angles |
| Microscope | Used to see small objects magnified. |
| Odometer | Measures the distance covered by wheeled vehicles. |
| Periscope | Views objects lying above the eye level of the observer and whose direct vision is obstructed. |
| Photometer | Compares the luminous intensity of the sources of light. |
| Planimeter | Measures area of a plane surface. |
| Pyknometer | Measures the density and co-efficient of expansion of liquid. |
| Pyrheliometer | Measures solar radiations. |
| Pyrometers | Thermometers to measure high temperatures. |
| Quadrant | Measures altitudes and angles in navigation and astronomy. |
| Refractometer | Measures the refractive index of a substance. |
| Salinometer | Type of hydrometer used to determine the concentration of salt solutions by measuring their densities. |
| Seismograph | Records the intensity and origin of earthquake shocks. |
| Sextant | Measures angular distances between two objects. |
| Spherometer | Measures the curvature of spherical objects. |
| Sphygmomanometer | Measures blood pressure. |
| Stroboscope | Views the objects moving rapidly with a periodic motion and to see them as if they were at rest |
| Tangent galvanometer | Measures the strength of direct current. |
| Theodolite | Measures horizontal and vertical angles. |
| Thermostat | Regulates constant temperatures. |
| Viscometer | Measures the viscosity, i.e. the property of resistance of a fluid to relative motion within itself. |
| Voltmeter | Measures potential difference between two points. |