I'm looking to purchase reagents for the Taylor CYA test. I see there are two optional methods when it comes to viewing the result:
One being a single CYAView tube in which the sample is mixed with reagent and then read using a slider that moves the dot up and down:
The other using one vessel for the mixing and another for the reading:
http://piscines-apollo.com/cubecart/par ... yamix.html
http://piscines-apollo.com/cubecart/par ... aview.html
The TFP 'extended' test method describes the latter, but does mention the single tube (sliding reader) as an alternative.
I've read that the disappearance of the dot can sometimes be difficult to visualize. Just wondering if maybe the view tube with slider makes that a bit easier - i.e. move slider up and down until you get it right, whereas with the two tube 'fill' method, you have to decant and try again if you overshoot the 'dot disappearance point'