private ConductivityJsonConverter(ConductivityUnit unit)
 {
     this.unit = unit;
 }
 /// <summary>
 /// Initializes a new instance of the <see cref="Gu.Units.Wpf.ConductivityConverter"/> class.
 /// </summary>
 /// <param name="unit"><see cref="Gu.Units.ConductivityUnit"/>.</param>
 public ConductivityConverter(ConductivityUnit unit)
 {
     this.Unit = unit;
 }