Chauvin Arnoux CA 6503 [P01132504] 250V / 500V / 1000V Hand-Cranked Portable Insulation Tester. The Chauvin Arnoux CA 6501 megohmmeter is completely autonomous due to its magneto power supply. it is suitable for use on construction sites, industrial and domestic, electrical distribution networks, telecommunications. It is suitable for many applications, such as the compliance of electrical installations according to the standards, or preventive maintenance of cables, motors, circuit breakers, transformers.