Another Phosphates Test Besides API ?

[Bev C]

 i need to check my phosphates  in my freshwater tank and bought APi phosphates test kit the Exp date says it is still good but it stays the same color  no mater after 3 tries .. I had to stop using APi nitrates test kit  due to it always staying blood red … i have switched to Aquarium coop strips for my nitrates  testing 

Is there a good phosphates tester for freshwater besides Api  i saw Fluval had a test kit hfor phosphates anyone used that kit ..    or is there a good digital tester to use for phosphates like they have for ph 

Thank you for any info and help 

Edited February 25, 2022 by Bev C

[Mmiller2001]

I've found that all test kits have to be calibrated and it's the only way to make sure they provide good information. 

But Sera and Salifert come to mind. I know the Salifert only goes to 2ppm. You'd have to look into Sera. Seachem has a line of test kits too.

[Bev C]

thank you @Mmiller2001   i saw seachem had a test kit might try that one