FC 10 Ml mark on test tube

Envieddesigns

Bronze Supporter
Apr 27, 2021
217
New Jersey
Pool Size
23000
Surface
Plaster
Chlorine
Liquid Chlorine
Good day all,
Can someone tell me which of the two is the proper way of testing FC at the 10 ML mark?
photo 1 shows the water line I guess at 10ML mark but sort of a air bubble sitting above it ?and photo two is that air bubble sitting at the 10ml mark. So I’m obviously getting different readings with two and want to know which is proper.
 

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