What are the meteorological observation instruments?

Thermometer, thermohygrometer (both pieces are placed in a louvered box, so the louvered box is also a necessary meteorological instrument.) Barometer, anemometer, wind vane, wind pressure plate, rain gauge, sunshine gauge. All of the above are traditional weather instruments. They are still in use, but have been improved to allow unattended automated measurements. More modern are radio sounding balloons and receivers. The modern ones are weather radar and weather satellites with receivers. Airports, seaports, and rocket bases also have airborne dust recorders, visibility recorders, cloud base altimeters, and so on.