This procedure is looking promising!, so
I have had my trident NP for almost a month; when I received it, it was reading acceptable, but once I performed the calibration days later, the phosphate started reading 0 inclusive when I had a phosphate spike a few days later, so this is what I did yesterday.
1 factory defaults
2 resets trident
and don’t test manually.
Keep in mind that the reagents will reset to 100%.
This morning, which my test is scheduled for at 5am, the phosphate was accurate with my hanna (for the first time).