How often should the units be calibrated?
At least once a year, which is the minimum required by the regulatory agencies such as UL. However, units that are in constant operation more than one shift per day, five days per week should be calibrated every six months. Note also that ROD-L manufactures the ML11 and ML12 Test Load boxes for daily (UL required!) pre-shift functional checks of the hipot and ground continuity testers.
