API test question

JAYWARREN

New member
When you test your water with the ALI test kit and compare the results against the test cards, do you hold the water tub tight against the card? Or do you hold it off the card so light gets behind the tube to compare results? The color is different and darker if I hold tight to card. Thanks
 
Also don't put it up against the card. Holds it about a half inch away. I've checked the results with better test kits. Salifert and elos works for me.
 
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