Hanna Calcium Checker Lost Calibration?

[Fringe09]

Hi Guys. Purchased the Hanna Calcium Checker on the 11/18/17 and up until today it has been working great. I'm using the Hanna deionized water and minipipette to make sure I only get 0.1ml of sample water.

Today, three checks in a row yielded results of 579, 538, and 479. Red Sea two checks in a row yielded results of 425 both times which is where it should be based on my dosing.

I just ordered the Hanna Calcium Checker Certified Standard Kit. I'm hoping it will show that the checker is no longer calibrated.

Has anyone else experienced this issue before?

 

[Mindi]

No..and it always reads 403 0r 404 0n the check cuvettes in the validation set.

 

[Fringe09]

No..and it always reads 403 0r 404 0n the check cuvettes in the validation set.

Thanks. Check kit should be here next week. I'll know then.