Silverline - TWIN POLE LED VOLTAGE TESTER - 427661 Twin pole LED voltage tester with no internal power source and integrated CMOS chip. Test range 110-750V display range 110, 220, 380, 450, 600 & 750V AC. Display accuracy +/- 15%. Dust proof, waterproof, shock and impact proof. Operating temperature -10 degrees c - + 50 degrees C. IP65.