[Patrice]

Great! thank you! that's exactly what I was looking for

Do you know if one is bether than an other:
eBay: NEW!! Co2 Drop Checker-Highest quality handmade glass (item 250068719948 end time Jan-07-07 09:50:59 PST)

eBay: Co2 Drop Checker-monitoring proper dosage of CO2 (item 250069035332 end time Jan-31-07 16:21:09 PST)

also, what solution do you use in this? a kh ref solution?

Thanks