Any good Co2 monitors?

Im looking for a decent Co2 monitor, most importantly cheap and durable. Can anyone point me at a product tried and tested? Thanks!

This is the cheapest i could find, has anyone tried this?

http://cgi.ebay.com/Indoor-Air-Quality-Monitor-Temperature-RH-CO2-Meter-/190486343815?pt=LH_DefaultDomain_0&hash=item2c59def087

wow
thats exspensive in my book
hmm ill look for u

http://alpscontrols.com/Product/ProductDetail.asp?xUserID=4563&xCustUserID=4563&xUserType=EXTERNAL&xCustID=1&MC=0&RxN=4114332.470732&ProdID=48771
all i could find
was feelign a little lazy srry

newb weed grower said:

http://alpscontrols.com/Product/ProductDetail.asp?xUserID=4563&xCustUserID=4563&xUserType=EXTERNAL&xCustID=1&MC=0&RxN=4114332.470732&ProdID=48771
all i could find
was feelign a little lazy srry

Click to expand...

Right on bro...that one there is just the chipboard and co2 reading stuff on it. Looks like if i bought this id have to buy a bunch of other stuff to make it complete. Thanks tho!