Hana ULR Phosphate checker

[Makers Marc]

There is more to it than that - ie it could be a defective cuvette or something confounding the test - I would suggest you call Hanna tech support - they will likely be able to quickly troubleshoot it (they have for me) = let everyone know how it works out. Maybe a defective unit?

Perhaps. Ill call tomorrow, it is weird that it just started happening. Ive tested 3x per week for the past 4 months and have used it for a year overall.