On a slightly different subject, when comparing varying colours of the test
to a sample colour card, should you hold the test up to the card or slightly
away (if so, from what distance) and under what lighting conditions. The
instructions are never clear

Some test kits have colours that are so close between each value, that 2
people in the same room with the same test would give a different reading.

My guess is that you should hold the test directly up against the card in
neutral lighting.



"Nighthawk" wrote in message
news:1K56d.549864$gE.276499@pd7tw3no...
Well this might sound like a dump question from the subject but am kind of
confused.

I went to the LFS to get a calcium test kit and this time i am buying the
SeaTest test kit and after a brief conversation with the owner. he told
me to test it correctly and i asked him what do u mean by correctly. He
said when you add the reagent drop by drop to count how many drops, i
should stop when the drop hit the solution in the test tube ( not after
you shake or swirl until the reagent has mixed in well with the rest of
the test water ).

As far as i know, if the reagent is to react with all Calcium ion in the
test solution, i should be swirling and shake it to make sure all Calcium
ions are reacted to get an accurate reading rather than on at the top
portion when the drop hits the water and turns blue.

Can someone shed some lights on this.

Thx in advance for any help.