Lightning SCHIRTEC (S-AM, S-AS, SA, S-DAS, S-DA) are always checked the tester SCHIRTEC SA-1T, which gives confidence in the correctness of their work. On the tester lights «OK» LED green (which means "all right") or red "the FAULT" (which means "error"). Lightning is advisable to check at the beginning and end of the season of storms. Also, each lightning arrester is tested in the production and in the laboratory tester SCHIRTEC SA-1T before shipment to the consumer.