The probe is often a necessary of a test - it provides a galvanic connection between the meter and the tested object. In standard cases, a 1 kV probe is sufficient. A 5 kV probe is required for HV tests (high voltage insulation tests). When measuring continuity, to eliminate the resistance of the test leads, a presented high current probe comes in handy. The brush probe allows testing when the measurement is performed on a movable element, e.g. a drill spindle