1. Actinometer --an instrument for measuring the intensity of radiation, esp of the sun's rays.
2. Fathometer -- a tool to measure underwater depth of lake or ocean floors.
3. Planimeter -- a drafting instrument used to measure the area of a graphically represented planar region (on the map)
4. Lysimeter -- a measuring device which can be used to measure the amount of actual evapotranspiration which is released by plants, usually crops or trees.
5. Hygrometer --an instrument for measuring the moisture content in the atmosphere.
6. Pyrometer --it is a type of thermometer used to measure high temperatures.
7. Rotameter-- a device that measures the flow rate of liquid or gas in a closed tube
8. Opisometer -- an instrument with a revolving wheel for measuring a curved line, as on a map.
9. Tellurometer-- device that measures distance by means of microwaves.
10. Anemometer-- device used for measuring wind speed, and is a common weather station instrument.
11. Hydrometer-- an instrument used to measure the specific gravity (or relative density) of liquids.
12. Barometer -- a scientific instrument used in meteorology to measure atmospheric pressure.
13. Clinometer --an instrument for measuring angles of slope (or tilt), elevation or depression of an object with respect to gravity.
14. Venturimeter-- tool used for the calculation of a fluid's velocity as it goes through a pipeline.
15. Sinometer --it is a voltage sensor, it can measure AC/DC Voltage.
16. Manometer --an instrument for measuring the pressure of a liquid.
17. Nephometer-- an instrument for measuring the amount of cloud cover in the sky.
18. Seismometer-- an instrument that measures motions of the ground, including those of seismic waves generated by earthquakes, volcanic eruptions etc.
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