topgundcp
Aquarium Advice Apprentice
When testing for Nitrate, the instruction says that The tube should be viewed
against the white area beside the color chart. If I put the tube on the white area touching the card, The color is close to read 20ppm, but if I leave a little space between the tube and the card, it would read 10ppm. Which way is correct ? please advise. Thanks
against the white area beside the color chart. If I put the tube on the white area touching the card, The color is close to read 20ppm, but if I leave a little space between the tube and the card, it would read 10ppm. Which way is correct ? please advise. Thanks