Air fuel meter

Looking at maybe adding some new toys to the shop. I see several meters available for 200 or even a little less that go off a sensor, but don't really want to be welding bungs in every head pipe I work on. Anyone know of some good meters that have the "sniffer" attachments and what are anyone suggestions on what to get.

On a side note, looks like what I am seeing is a sniffer is just an o2 sensor rigged up to slide in the end of the exhaust, is that the general setup? Also, I think it was a WEGO meter that recorded the changes, what others do? Would make it a lot easier since I am actually going to have to be riding it to get a reading.

Thanks for the help.