The Hanna tester arrived today and here are the first results:
Red Sea Nitrate Pro (high range): between 12 and 16.
Hanna Nitrite ULR method: 14.15.
Had to dilute the reacted solution by 2 (added 10ml tank water) and then got a reading of 149.
Not bad! ;Joyful
I've put in a preorder for the GHL ION Director which also measures Nitrates. This is great because it gives me a way to test the ION Director Nitrate measurement without trying to guess colours.
Great! thank you for letting me know.