Really good primary test probes. Better than any of my gauges, attaches directly to the gauge's probe holders and provides more stable readings than those that come with any of my gauges. The downside of the kit design is that the auxiliary connectors, alligator clips, and spade lugs connect directly to the meter. Therefore, the test connection must be connected directly to the meter. It's much more useful to have these alternative mounts at the end of the test leads, allowing for much more flexibility when connecting. No case except a plastic box for extra probe tips and extra connectors. I would trust the main sensors at the 1000V rating of my gauges. The situation with the missing pins on the aux connections is unfortunate.