There are many high voltage differential probe on the market, most of them pretty expensive. If you want to have a good product very cost effective, with an impressive performance cost ratio, Micsig could have one you’re looking for. We’ve tested DP10007, a probe useful for differential measurements up to 700V, with 100MHz bandwidth, with a selectable attenuation of 10X and 100X (gain accuracy is ±2%). DP 100007 is USB powered therefore it is possible to use USB port on your DSO to supply power to it. Micsig sells their probes with a plastic carrying case and all the well made measurement tools you could require during its use.