HSA 194 distance voltage detector for contactlessly verifying that centre-earthed monophase railway traction current lines are dead in accordance with EN 50110-1 (DIN VDE 0105-100) from 110 kV to 420 kV / 16.7 Hz. Category "L" for overhead lines. Suitable for use in wet weather conditions. With visual and acoustic indication and self-testing element, transport case included.