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yeah, I have one and used it. it's like a half inch wide, and dense cultures of t-Iso it only has to go down like 5 or 10 cm to disappear (I don't remember). Can do it in a coffee cup. Comes with a chart that tells you how many cells per mL for the different kinds of phyto at each disappearance depth.Hi everyone! Florida Aqua farms got back to me about the microalgae density measure. They replied, on quote;
"It can only be as tall as the stick the width does not matter. It is like 35 cm long."
Clearly this device is small enough to be hobbyist friendly...