CO2 test wrong?

[Wildwhimsy]

So I’m having an issue with my Hanna test. If I’m using the test correctly then right before lights on my c02 was 30ppm and now at the midway point it’s 11ppm. I’m not sure how that’s possible. Also the direction show putting the solution into the syringe with the long thin tip on it however when I try that the syringe cannot suction up the solution. So I’ve been sucking up the solution without the tip then adding the tip. Any solution left in the tip after I get faint pink I just suck back in before reading the number. Am I doing this wrong? Ugh! Really wanting to dial this in before this algae destroys my sensitive walichi

 

[Unexpected]

@Naturescapes_Rocco
@Dennis Wong

 

[CincyScaper]

The solution does not get into the syringe it is just to know how much to pull back, when attached to the long thin tip. - This video goes over this. - . - you might have to change the subtitles to English. I tend to not shake the container as much since it can dissipate the co2.