| Wave Measurement Tools: Sound Lab's wave measurement tools display data about waves generated by sound sources. Measurement tools receive input from sound sources and microphones, devices to which they are wired either directly or through branch tools or Fourier combiners. The four wave measurement tools are the oscilloscope, Fourier analyzer, frequency meter, and sound level meter. By default, wave measurement tools work in Stop mode. However, you can change this property for all measurement tools in the background properties.