To determine the resonance lengths of a given frequency sound using the Resonance Apparatus (RES-APP), we recommend the following:

• Go Direct^® Sound Sensor (GDX-SND) (use the Sound level C-weighted channel)
  or
• Sound Level Sensor (SLS-BTA)

In order to relate the speed of sound to the air temperature, consider a temperature sensor. We recommend a surface temperature sensor for its fast response.

• Go Direct^® Surface Temperature Sensor (GDX-ST)
  or
• Surface Temperature Sensor (STS-BTA)

Additional information:

• How do I turn on other sensor channels for Go Direct Sensors?