Quote:
Originally Posted by mrhasan
Finger prints on the vials can throw off the numbers too. I used to handle those vials using napkins  |
Yes, so can using different sides of the vials (quartz thickness isn't always even). I always polish up the vials, and line them up in the checker the same direction every time. When I handle them to add reagents I don't touch anything except the lid and then the very bottom 1/2" of the vial (the test is taken about 1/3 of the way down the vial). They are fussy little things, but if used carefully they are very accurate. The Calcium Checker requires
much more care to use properly. It's VERY easy to mess up that one. The alkalinity and phosphate/phosporus checkers are much more forgiving. I use them all the time, but the calcium one collects dust in my cabinet.
