dps51
Landlord.
this is the one I use one in each fv works grate
also you get a stick on thermometer
http://www.ebay.co.uk/itm/351871461484?_trksid=p2060353.m2749.l2649&var=621196822993&ssPageName=STRK%3AMEBIDX%3AIT
also you get a stick on thermometer
http://www.ebay.co.uk/itm/351871461484?_trksid=p2060353.m2749.l2649&var=621196822993&ssPageName=STRK%3AMEBIDX%3AIT