Hi Jim. To be frank, it seems a bit premature to look for probe information when you don’t have a scope, and maybe don’t know what you are going to use it for exactly. It might be better to look for some help choosing and acquiring whatever type you decide on, and how you are going to get it. There are a few 535’s on eBay, but no indication of working or not. Prices seem to be around the $400 mark plus shipping. As far as probes go, I pretty much stick with the P6006. I have never had a use for 100x probes. When I was selling scopes I brought in a quantity of Chinese probes. They were pretty much the same as the Tek ones. Quality was good and they were quite inexpensive. I always use 4 foot ones, the six and nine foot cords always seemed to get in the way and snagged on everything on the bench. If you have one scope, a couple are all you need anyway.
John Williams