Thoughts on Regulator setup

do you need a checker solution and a second bottle of that solution that is a set color for the drop checker with two glass bubbles??
 
oh alright... that sounds alittle more reasonable
 
It makes sense if you think about it, the liquid in the reference side is there for that reason, to compare what 30ppm Co2 with a 4dkh checker looks like.
 
yeah i was just spacing out thinking to myself...
"how the hellllll am i gonna get each one into its own side without mixing them!!??"
 
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