adam1986:
I am sorry to disappoint you but that is worth the cost (i am using that sensor since years) and its made in USA not China.
Good for you. I do hope you realise you sent a link to the venerable e-bay site, with a description in clear Chinglish (or did language standards really slip so badly in the USA?).
The manufacturer's site is less bad, yet within a few lines I found the first grammar error. At least they offer the sensors at a much less shocking price: less than USD 40.