Re: Multitest Iron????
Normal = 0.1+ ppm
Low range = less than 0.1 ppm
The reason you don't have to be as precise is because in the low range test there is sucha small amount of iron that even an error as large as 5-10% due to dilution is still a very small error.
For example, say you have a concentration of .05 ppm. If you fill the sample vial 10% further than you should (which is actually much more difficult than you might think, it starts to look too full), then the test will read as .055 ppm, which is practically the same number for dosage purposes. Admittedly, it is not EXACTLY the same, but in a low range kit your margin for error is greater, so an exact sample volume is not as critical.