The Velleman Pink Noise Generator Soldering Kit is an excellent pink noise generator, and a spectrum analyzer is essential if you want to analyze the acoustic properties of a room (usually a living room).
In addition, the microphone should have a frequency response that is as linear as possible (20Hz to 20kHz). Using an equalizer, you can not only check the response, but also correct it. The kit can also be easily adapted to the generation of "white noise".