The Rubens Tube Pro is an exciting and very visual way to demonstrate the concept of a standing wave.
By making measurements it is also possible to calculate the speed of sound. The Rubens Tube Pro has a built-
in amplifier so it can be driven by a wide range of signal sources including phones and tablets.

Specification:
Length: 2m
Speaker: 20W, 8
Amplifier: 7W mono
Input sensitivity: 40mV
Power supply: 15V 0.5A dc
Gas supply: Natural gas or Propane (40 millibar max)