/// <summary>
    /// Change for the next the wave length value.
    /// </summary>
    public void NextWaveLength()
    {
        if (waveMode == WaveLengthTypes.Li)
        {
            waveMode = WaveLengthTypes.Na;
        }
        else
        {
            waveMode++;
        }

        switch (waveMode)
        {
        case WaveLengthTypes.Na:
            waveLengthDisplay.text = "Na";
            break;

        case WaveLengthTypes.K:
            waveLengthDisplay.text = "K";
            break;

        case WaveLengthTypes.Li:
            waveLengthDisplay.text = "Li";
            break;
        }
    }
    public WaveLengthTypes waveMode;            // Actual wave length being measured

    void Start()
    {
        timeElapsed = 0;
        waveMode    = WaveLengthTypes.Na;
    }