help with test kit

[JD]

i bought a testra test kit which tests for No2 GH KH PH Co2

when doing the KH and GH tests it seems a bit unclear as to what you actually do it says "release droplets of the test liquid one by one after each droplet shake the test vial gently, repeating untill the water changes colour" for example with the GH test its from red to green and it goes a light red colour after 2 drops giving me 2 DH which is way too low for a marine tank, however if i keep going it seems to stop getting a darker red at about 7-8 drops giving me 7-8 DH. anyone got one of these test kits?

i bouhgt this test kit for when i was going to have FW tank anyone recommend a decent marine test kit?

[icereefer]

Myself,I've tried. red sea,hagen, seachem,fastest, and I've found saliferts one of the best for salt water test kits.
check with some of our sponsors I know they carry there kits. there a little spendy, but when it comes to my tank, I care more about getting a true reading on my tests. and salifert hasn't steard me wrong yet.