it's CO not CO2 /pedant
but they are good, only last a few months and you have to look at them to check.
Some student unions (well mine, dunno about anywhere else) sell them cheap, 1.95 for two IIRC
(
The Scone from U.N.C.L.E.,
Tue 16 Dec 2003, 13:52,
archived)
too true, i flunked chemistry :(
(
cybo,
Tue 16 Dec 2003, 13:55,
archived)