I would like to find a thermometer suitable for green house - ideally max/min
- which can be connected wifi to PC or router in the house.

Does anyone know of such a thing?

There are various similar devices - but they have an indoor base station for
reception of data, with no facility for PC connection which is what I really
need.

If not I will have to get a good max/min thermometer and go out and read the
temperatures :-(

Any recommendations for basic max-min?

(My T&M one failed after about a year - I sent it back to them and they gave me
a refund)