How do you use a multimeter to check high voltage?
https://www.youtube.com/watch?v=q7P47QDGMo8
What is a probe in circuit?
Current probes A current probe generates a voltage proportional to a current in the circuit being measured; as the proportionality constant is known, instruments that respond to voltage can be calibrated to indicate current. Current probes can be used both by measuring instruments and oscilloscopes.