Infra red thermometer for surface tests and a standard probe type for cavity tests, get one that has a -20oC to +500oC and that allows you to test fridges etc as well as pyro ovens.
Generally I’m not too fussed about brands, it’s only a label IMO, so I just get whatever I need from CPC or whoever.
It’s very rare that you’ll adjust a stat these days Martin, if you even can. In fact I think I lost my custom screwdriver for that and adjusting gas taps.
K.