50 m Sonel test lead in yellow color with banana plugs ends. The test lead is dedicated to earth resistance measurements. 

Test leads on reels are designed specifically for outdoor work - they have increased resistance to mechanical damage. One end of the test leads is terminated with a secure banana plug (4 mm), while the other end has a 4 mm lamella for connecting it to the reel and directly to the probe driven into the ground.

The test leads are also available with shielding and this version is dedicated for testing with the impact method, where the results are strongly influenced by interference from ambient electromagnetic field. One end of the test lead has two terminals - one for the working conductor and the other for shielding.