Subject: What are the most accurate weather instruments? Why?

I am doing a science project in which I make my own weather instruments and 
research why or why not they are working correctly. I have made a rain gauge, 
wind sock, thermometer, and barometer. For this project, I have to contact an 
expert. So, I have a few questions for you:
o What are the most accurate weather instruments?
o Do homemade weather instruments give just as accurate results as 
professional ones? Why?
o Out of all of the weather instruments I made, which do you think is most and 
least accurate?

Re: What are the most accurate weather instruments? Why?