Lead Acid Battery Tester w/ CELLCASE

The unit does come calibrated from the factory and the certificate is included. It does not require calibration annually. The only maintenance we really recommend is periodic cleaning of the tester's contact terminals, including the negative probe tip. Clean all tester terminals with a soft cloth and 91% isopropyl alcohol (Never use abrasives, such as a pencil eraser, to clean terminals). Isopropyl alcohol will not harm the tester's faceplate or enclosure. Clean contact terminals help insure a good electrical connection during the Pulse Load test cycle, which is important for accurate test results.