Originally Posted by hoppycalif
Dennis, how did you seal around the probe, to keep the air from leaving the drop checker? Incidentally, you beat Tom Barr to this! He has been posting about making one of these by mid December. The only non-fool-proof part of this design that I see is the electrical interferrence issue. How do you satisfy yourself that the probe is not being affected by interferrence?
I just came across this little part
that sounds like its made for a situation just like this. Check it out.
Also does anybody know what kind of indicator solution is used in the Red Sea Drop Checker/"Co2 Indicator"????