I recently acquired an Apex and I'm having a bit of a problem. For the last couple years I've tested my PH with Salifert, API, Red Sea Test kits. As one of the easier test to perform I would usually get a reading between 7.9 and 8.1
I set up the Apex a few days ago and immediately noticed the PH to be in the 7.5 to 7.6 range. I recalibrated manually several times and still came back with the same numbers. I tested the same sample at the same time with my existing Salifert and a new box I just opened in addition to the API. All three came in around 8.0.
I have since contacted Neptune and they promptly replied and requested I do a manual recalibration. I used my last two pouches of regent and performed the test as requested and provided them with the results after each step. They determined that the probe was in fact accurate based on the readings of 6.99 at 7.0 and 10 at 10.0.
I was asked to verify the Salifert with the same regent. I did so with the 7.0 and I thought the result reflects accurately.
In any case I'm torn here. It's difficult to put aside 3 independent test kit results over one probe result. I forwarded the last pic to Neptune showing that the Salifert was very close to the 7.0 regent. The Neptune agent disagrees and feels the image "looks more like 7.4 and 7.7"
Thoughts, ideas, recommendations?
I set up the Apex a few days ago and immediately noticed the PH to be in the 7.5 to 7.6 range. I recalibrated manually several times and still came back with the same numbers. I tested the same sample at the same time with my existing Salifert and a new box I just opened in addition to the API. All three came in around 8.0.
I have since contacted Neptune and they promptly replied and requested I do a manual recalibration. I used my last two pouches of regent and performed the test as requested and provided them with the results after each step. They determined that the probe was in fact accurate based on the readings of 6.99 at 7.0 and 10 at 10.0.
I was asked to verify the Salifert with the same regent. I did so with the 7.0 and I thought the result reflects accurately.
In any case I'm torn here. It's difficult to put aside 3 independent test kit results over one probe result. I forwarded the last pic to Neptune showing that the Salifert was very close to the 7.0 regent. The Neptune agent disagrees and feels the image "looks more like 7.4 and 7.7"
Thoughts, ideas, recommendations?