pH Testing / Monitors - Trusting Results

DeepBlueSeaV1

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So I'm preparing to add a calcium reactor to my system. Have a pH controller delivered. Already have a Pinpoint pH monitor.

Calibrate the pinpoint with 7 & 10. Calibrate the Milwaukee with 7 & 4.

Test with Salifert pH test.

RESULTS

Pinpoint - 8.1
Milwaukee - 8.7
Salifert 8.3

No way I'm running an 8.7. Personally, I feel like the salifert is most accurate, but what's my naked eye supposed to do in this scenario? Or
Am I just splitting hairs and I should just understand the device and look for the consistency in those readings.

The Milwaukee pH controller is going to go on the calcium reactor, knowing that's reading high, just set the pH to be like 7.1 to think I'm running 6.7.

Or would re-calibrating the Milwaukee with a 7 & 10 solution be more accurate?

The pinpoint probe is only about 9 months old and as I said, just calibrated using 7 & 10.

Thoughts?
 

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