Sera / nutrifin test kits

dont know about sera.but nutrafin gave me CA reading of 600 once,and when i checked it with a tropic marine testkit,the reading was 380.so i consider nutrafin to be shit
 
Never used the sierra range so cant comment, but i agree with the nutrifin and stay away from it my kits of choice are the tropic marine.
 
i used sera and when i compare results with seachem test kits they`re pretty similar.
 
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