You should always . The instructions state that you should always inspect the multimeter, test leads, and any accessories for damage prior to every use —and if any damage is found, do not use the tester until repairs are done. Further, the manual advises you to never ground yourself when taking electrical measurements, recommending you use dry rubber insulating mats.
Read the numerical value. Standard North American household outlets should read roughly . 3. Testing Resistance and Continuity equus 4320 manual pdf