Field of application: ring electrode set for measuring surface and volume resistivity according to IEC / EN / DIN 61340-5-1 and 61340-2-3 Main features: Structure with two concentric electrodes in the dimension of Ř 30 (+/-0.5) mm (inner point) and Ř 57 (+/- 1) x 3 (+/-0.5) mm (outer ring), standard weight can be produced by setting up a 2.5 kg round electrode, hardness contact rubber 65 Shore A, total resistance on a metal plate less than 100 &! Scope of delivery: ring electrode, counter electrode, insulating plastic plate, measuring cable.