Important scientific instruments.
1.Altimeter
It measure altitude and is used in aircraft
Altimeters that work this way measure height by measuring the pressure compared to sea-level, but that's not the only thing that causes pressure variations on Earth. Air pressure is constantly fluctuating across Earth's surface due to changes in the weather—so that has to be corrected for if pressure-based altimeters are to work accurately. Another drawback of pressure-based altimeters is that they don't take account of dangerous obstacles such as buildings and power lines.
2. Ammeter
It measures strength of electric current (in amperes)
An ammeter (from Am pere Meter ) is a
measuring instrument used to measure the
current in a circuit . Electric currents are measured in amperes (A)
3.Anemometer
It measures force and velocity of wind When you hear weather forecasters warning of how fast the wind is going to blow, do you ever stop to think how they're going to measure it? Wind isn't something you can see very easily, so you can hardly time it with a stopwatch like you'd measure the speed of an Olympic sprinter or a race car! Fortunately, scientists are amazingly inventive people and they've come up with some pretty clever ways of measuring wind speed with gadgets called anemometers . Let's take a closer look at how they work!
Photo: Measuring wind speed with a three-cup, handheld anemometer. The square plate at the back is a vane that aligns itself with the wind so you can measure wind direction too. This model, used by the US Navy, is an Ames RVM 96 B capable of measuring wind speeds up to about 50 m/s (180 km/h or 112 mph). Photo by Maebel Tinoko courtesy of US Navy.
4.Audiometer
It measures intensity of sound
5.Audio phone
It is used for improving imperfect sense of hearing
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Science