Hanna Colorimeters

[Magickiwi]

Is there a way to calibrate a Hanna checker? I bought the low range phosphate one and it is showing my tank as .14ppm and three chemical tests show my phosphates as around 0.01ppm. I'm thinking if my phosphates were that high I'd have huge algae problems and my livestock would be on deaths door, and the truth is my system is thriving.

FYI avoid an internet retailer called eseasongear.com. Took 3 months to get my order and the silica colorimeter I bought was obviously used. It was physically broken and missing all of the "c" reagents.