redsea pro nitrate test kit

[swissgaurd]

i have purchased a nitrate test kit im first time user of this brand of kits.
i really like the color meter i find it really easy to distinguish the colors,
my qestion is should i use the high range ,or just the regular way.
i used the color meter and got 4ppm
i then did a test using high range and got from what i recall 12ppm

my salifert was giving me 20 ppm

if i had never done any testing before with salifert i probably would have stuck with 4ppm.
so wich chart should i be using

thanks

vic

 

[fruit bat]

If you are getting readings above 4ppm then you should be working on the high scale. I personally wouldn't be worried about readings of 12ppm but would try to get down to around 4ppm if I could