I posted recently about my RO water pH being high. Today I wanted to test my tap water, retest my RO water and check to make sure my pH meter was keeping calibration. I have a MW-102
The real question of this thread is...should I be swirling the probe around until the reading stabilizes or swirl it for a few seconds and then let it sit until it stabilizes.
So here is what I just did...
1) I calibrated to 7.01 by swirling and letting it sit. Took about 5 to 8 seconds.
2) I calibrated to 4.01 and same as above.
3) I rechecked 7.01. It was right on.
4) I rechecked 4.01 and it was right on.
5) I then check my tap water. I swirled it and let it sit. I took about 30 to 40 seconds but finally stabilized around 8.5ish. I then swirled it around again and let it sit. It went up another .4. I did that a few more times until it finally got up to 10.2X (can't remember the exact number). I kept swirling and it was stable. It didn't move up or down. I then let it sit and it stayed right where it was..
6) I retested 4.01 and 7.01 and they were both .01 off.
7) I then tested my RO water and the same thing happened as #5. Would stabilize until I swirled it then stabilized then swirled it. Finally stabilized at 9.3X and didn't move after swirling or letting it rest.
8) I then retested 4.01 and 7.01 for a 3rd time and they were again .01 off.
So why does my pH meter stabilize but then climb when I swirl it and then stabilize again? Is it because I'm testing 4.01 and 7.01 but my water pH was above 10?
The real question of this thread is...should I be swirling the probe around until the reading stabilizes or swirl it for a few seconds and then let it sit until it stabilizes.
So here is what I just did...
1) I calibrated to 7.01 by swirling and letting it sit. Took about 5 to 8 seconds.
2) I calibrated to 4.01 and same as above.
3) I rechecked 7.01. It was right on.
4) I rechecked 4.01 and it was right on.
5) I then check my tap water. I swirled it and let it sit. I took about 30 to 40 seconds but finally stabilized around 8.5ish. I then swirled it around again and let it sit. It went up another .4. I did that a few more times until it finally got up to 10.2X (can't remember the exact number). I kept swirling and it was stable. It didn't move up or down. I then let it sit and it stayed right where it was..
6) I retested 4.01 and 7.01 and they were both .01 off.
7) I then tested my RO water and the same thing happened as #5. Would stabilize until I swirled it then stabilized then swirled it. Finally stabilized at 9.3X and didn't move after swirling or letting it rest.
8) I then retested 4.01 and 7.01 for a 3rd time and they were again .01 off.
So why does my pH meter stabilize but then climb when I swirl it and then stabilize again? Is it because I'm testing 4.01 and 7.01 but my water pH was above 10?