The Test Probe TP-TP90 Set is a set of compact, isolated test probes. The test probe can be used on any measuring lead with 4 mm banana jacks. The probe has a polished stainless steel tip. The collar is flattened at one side, to prevent the probe from rolling. The Test Probe TP-TP90 Set comes in a set of 2 probes, a black one and a red one.