How To Test Nitrate Reading Question

Discussion in 'Freshwater Beginners' started by UBR, Apr 17, 2019.

  1. UBRValued MemberMember

    Can someone help me reading my Nitrates? It shows different colour in different positions. Which one is the right way?

    Thanks in advance.

    Attached Files:

  2. Morpheus1967Well Known MemberMember

    I always hold it close to the card, in natural light if possible.