If you mean the core that works with smartthings, that has been deprecated in favor of webCore. ( there are a lot of things called core, though, so maybe you meant something else. )
However, Most professional installers will not want to use SmartThings as the basis for a service line because of the instability. There might be a business opportunity in providing services to people who had already bought and installed SmartThings for themselves, though. But one of the problems is that it’s likely that a large number of clients will all have an emergency at the same time, which can really strain resources.
As far as Zwave tools for professional installers, just get the toolbox. That’s what it’s for. It happens to be on sale right now for $149 instead of $249, but even at $249 it’s an essential pro tool.
It happens to be on sale right now for $149 instead of $249, but even at $249 it’s an essential pro tool.