Using a pixel editor you can see that the 0.5ppm colour swatch has more of the same colour as the sample.
Hi @X3NiTHUsing a pixel editor you can see that the 0.5ppm colour swatch has more of the same colour as the sample.
The JBL tests are certainly amongst the better ones. Viewing from above as well as using a test tube of tank water to take into account the colour of that.Hi @DaveWatkin
You can see from the pictures below how the JBL test kits are used:
JBL PROAQUATEST PO4 Phosphate Sensitive
Determines phosphate value for perfect plant growth or possible cause of algae growth in freshwater/marine water & pondswww.jbl.de
I like this comparator system. The only exception to the colour comparator (that I know of) in the JBL range is the potassium (K) test kit, which is based on turbidity (cloudiness) but this, again, is done by viewing the tube from above. I can't be certain but my guess is that JBL test kits are very probably manufactured by Macherey-Nagel.
JPC
Nah mate, now we know that it doesnt work and the next guy who asks we will show this threadI'm clownshoes at this stuff.