🔬 Hanna Instruments HI782 11 Nitrate Calibration: Ensuring Precision and Accuracy in Nitrate Measurement Review

Hanna customer service reported that the standard may be poor. They will send me a new one when they get more, whenever that is. More than a week has passed and I have NADA!

One of the bottles has a pretty good scratch, not what you need with a colorimeter, I'll just swap it out for a new bottle. When I tested my HI736 tester with this 100ppb certified standard, I got 80/82/80ppb in three tests. I was expecting something closer to 100ppb. 20% variance is a lot!

This kit was purchased as a test kit to ensure my Hanna HI-713 Low Phosphate Tester is working properly within the +/- 0.08ppm tolerance range. The kit includes two vials with samples and instructions. First, the instructions essentially call for one vial to be placed in the Hanna Checker for step C.1 and then removed for step C.2, where the second vial is placed after adding the reagent pack (just like normal testing procedures). . The problem is that the instructions refer to one vial as a…