<Tr> <Td> profilometer </Td> <Td> surface roughness </Td> </Tr> <Tr> <Td> protractor </Td> <Td> angles </Td> </Tr> <Tr> <Td> psychrometer </Td> <Td> humidity </Td> </Tr> <Tr> <Td> pycnometer </Td> <Td> fluid density </Td> </Tr>

The instrument used to measure the speed and direction of clouds is called