*Scientific Meters and Their Functions *1. Ammeter* – Measures electric current *2. Voltmeter* – Measures voltage (potential difference) *3. Ohmmeter* – Measures electrical resistance *4. Barometer* – Measures atmospheric pressure *5. Thermometer* – Measures temperature *6. Hygrometer* – Measures humidity in air *7. Anemometer* – Measures wind speed *8. Seismograph* – Measures earthquakes (seismic waves) *9. Manometer* – Measures pressure of gases and liquids *10. Galvanometer* – Measures small electric current *11. Altimeter* – Measures altitude (height above sea level) *12. Lactometer* – Measures purity of milk *13. Hydrometer* – Measures density or specific gravity of liquids *14. Speedometer* – Measures speed of a vehicle *15. Tachometer* – Measures rotation speed (RPM) *16. Colorimeter* – Measures concentration of a substance in a solution *17. Photometer* – Measures light intensity *18. Spectrometer* – Measures properties of light/spectra *19. Electrometer* – Measures electric charge or potential *20. Pyrometer* – Measures high temperatures, especially in furnaces *21. Radiometer* – Measures radiation energy *22. Sonometer* – Measures sound-related vibrations *23. Dynamometer* – Measures force, torque, or power *24. Multimeter* – Measures voltage, current, and resistance (combo of ammeter, voltmeter, ohmmeter)