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Radio telescopes. Pulsars radiate most strongly in the radio spectrum so that is the best frequency range to observe them.
In my opinion, the drums are definitely the best instrument.
There is no best musical instrument because that's an opinion
Shells have an irregular shape; they are best measured with a flexible ruler, such as a cloth tape measure.
The best estimate for the circumference of a circle that has a diameter of 6 is 18.9
A clip on tuner measures the vibration of the instrument, rather than using a microphone, so it should be better at tuning your instrument, even if other instruments are playing at the same time. But if you have an electric guitar rather than acoustic, the instrument may not vibrate enough to activate the tuner's pickup. If you can try one out, before purchasing would be best.
The world's best selling instrument is the harmonica, considering they are one of the easiest instruments for anyone to play.
Validity in sociology refers to the degree to which a research study accurately measures what it intends to measure. It ensures that the findings and conclusions drawn from the research are based on reliable and accurate data. A study is considered valid when its methods and results align with the research question and theoretical framework.
Bassoon
Piano
There are instruments called Ceilometers which can measure cloud height and cover, but they're not especially accurate for cover (they are quite good for cloud height, especially at night) as a cloud can sit over the instrument and give a false reading. Also, unless cloud passes over them they give a false negative. The best instrument for measuring cloud cover is a trained Mark I eyeball (or two).
Any auto parts store sells fuel line hose. It is not terribly expensive. But be sure you get the correct ID (internal diameter). Best to take a piece of the old hose with you.