| 摘要 |
In the present invention, the electrical potential difference between the inside surface and the outside surface of a resin vessel is measured. A metal vessel loaded on a resin stand is filled with a liquid, and a resin vessel that has been filled with a beverage therewithin is disposed in the liquid. A first electrode is inserted into the beverage of the resin vessel, a second electrode is inserted into the liquid of the container, a circuit that connects both electrodes is formed, and a switch is provided that connects/disconnects the circuit. Furthermore, an oscilloscope is connected to the circuit, and a resistor is connected in parallel to the oscilloscope. |
