4-wire

METREL S 2001 Earth test set, 4-wire, 20 m

METREL S 2002 Earth test set, 4-wire, 50 m

METREL S 2007 Earth test set, 4-wire, 50m (for Smartec)

METREL S 2040 Earth test set, 4-wire, 20m (same as S 2122)

METREL S 2041 Earth test set, 4-wire, 50m (for Smartec)

METREL S 2123 Earth test set, 4-wire, 50m