14. Altitude: Altimeter
15. Velocity And Direction Of Wind: Anemometer
16. Sensitivity Of Skin: Algeismeter
17. Atmospheric Pressure: Aneriodograph/Barometer
18. Improvement Of Hearing Power: Audiometer
19. Quantity Of Heat: Calorimeter
20. Intensities Of Colours: Colorimeter
21. Longitude Of Vessel Over Sea: Chronometer
22. Detection Of Electric Charge: Electroscope
23. Voltage Difference: Electrometer
24. Depth Of The Ocean: Fathometer
25. Small Electric Current: Galvanometer
26. Relative Density of Liquids: Hydrometer
27. Change In Atmospheric Humidity: Hygroscope
28. Detection And Measurement Of Light: Photoelectric Cell
29. Salinity Of Water: Salinometer
30. Spectrum Analysis: Spectroscope
31. Hearing Of Heartbeat And Lung Sound: Stethoscope
32. Maintenance Of A Constant Temperature: Thermostat
33. Amplification Of Current: Transistor
34. Measurement OF Potential Difference Between Two Points: Voltammeter
35. Flow Of Air: Aerometer
36. Radiant Energy: Radiometer
37. Conversion Of Rays Into Mechanical energy: Radiograph
38. Measurement Of Intensity Of Light: Lucimeter
39. Radioactivity: Geiger Counter
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