An instument designed to read vary low values of resistance appears in Fig. 7.47. Because of its low range capability, the network design must be a great deal more sophisticated than described above. it employs electronic components that eliminate the inaccuracies introduced by lead and contact resistance. it is similar to the above system in the sense that it is completely portable and does require a dc battery to establish measurement conditions. Note the special leads designed to limit any introduced resistance levels. The macimum scale setting can be set as low as 0.00352 (3.52 m).