Thanks to Alan Johnson (was digital min/max thermometer)
 

Thanks for the help with the data logger question after getting my
fingers burnt a bit on eBay (the logger I bought when I asked the
seller I was told it had a probe, when it turned up it didn't!) I
ended up getting a Lascar EL-USB-2 from Rapidonline.com what a great
little unit.
Thanks for pointing me towards data loggers rather than digital
min/max thermometers.
If anyone's got a probe for a SATO SK-L200TH II please post a reply
and I'll get in touch off group.
Thanks again Alan.
Ford.