Unity Number Ranges and Serialized Class (Expandable)

unity_ranges_etc.cs

[System.Serializable]
public class Movement
{
  [Range(1f, 12.0f)]
  public float speed = 6.0F;
  [Range(1f, 12.0f)]
  public float runSpeed = 8.0F;
  [Range(1f, 12.0f)]
  public float jumpSpeed = 8.0F;
  [Range(0f, 1.0f)]
  [Tooltip("Percent of speed")]
  public float inAirControl = 0.25f;
  [Range(1f, 12.0f)]
  public float crouchWalkSpeed = 2.0F;
}

[Tooltip("Player speeds, etc.")]
public Movement movement;