gah yes to be nice those are crap...
give this one a try.. i love em...they are very accurate and cant crack and dont ever seem to fail.
http://www.drsfostersmith.com/Produ...ge-_-Heaters&ref=3969&subref=AA&N=2004+113767
I dont use Visi-Therms but it seems like alot of people here do..Hummm..