I bougt a hi 731 checker from Hanna and when i use it the reagens seems to make black/bleu particals so i can not measure it.
The reagens of two batches do the same and expire date is 06-2016
I see no particals in the curvet before adding the reagens.
my old test is from salifert and there is no color ore particals in that test.
i think it could come from plancton as i am running ats only for 2 years.
any of you know of this problem?
Greetings
Eric Jan