Using these Klein test leads is easy. First, make sure your meter has banana - type input jacks. Then, insert the banana plugs of the test leads into the input jacks of your meter. Attach the heavy - duty alligator clips to the wires or conductors you want to test. When testing, always follow safety procedures and make sure your meter is set to the correct function. Remember, these leads have a CAT III 1000V/CAT IV 600V safety rating, so don't use them in situations that exceed these limits. For maintenance, keep the leads clean and dry. Avoid bending the wires sharply or subjecting the clips to excessive force. If the leads show signs of damage, such as frayed wires or loose connections, replace them immediately to ensure safe and accurate testing.