Refractometer or Probe.. Which to trust?

tmccaffery · 04/23/2018, 04:04 PM

My Milwaukee is showing 37ppt and Neptune probe showing 35. My milwaukee I calibrated using the supplied distilled water 1.000 SG. Neptune with Neptune 53,000 solution. When I have probe in solution it reads 34.9; Milwaukee solution test 25ppt. I am confused... Anyone?

Tripod1404 · 04/23/2018, 04:24 PM

Do you have 35ppt calibration solution? I would test both with that.

tmccaffery · 04/23/2018, 05:16 PM

yes. I will test that

rocsec1 · 04/23/2018, 07:48 PM

It has been my experience that the Neptune probe isn’t always accurate. I go by my Hanna and use the probe to,watch for changes in the reading.

TxMex78 · 04/24/2018, 06:13 AM

Quote:

Originally Posted by rocsec1

It has been my experience that the Neptune probe isn’t always accurate. I go by my Hanna and use the probe to,watch for changes in the reading.

I do the same as well.

04/23/2018, 04:04 PM	#1
tmccaffery Registered Member Join Date: Apr 2011 Posts: 170	Refractometer or Probe.. Which to trust? My Milwaukee is showing 37ppt and Neptune probe showing 35. My milwaukee I calibrated using the supplied distilled water 1.000 SG. Neptune with Neptune 53,000 solution. When I have probe in solution it reads 34.9; Milwaukee solution test 25ppt. I am confused... Anyone? Last edited by tmccaffery; 04/23/2018 at 04:09 PM.

04/23/2018, 04:24 PM	#2
Tripod1404 Registered Member Join Date: Mar 2016 Posts: 1,821	Do you have 35ppt calibration solution? I would test both with that.

04/23/2018, 05:16 PM	#3
tmccaffery Registered Member Join Date: Apr 2011 Posts: 170	yes. I will test that

04/23/2018, 07:48 PM	#4
rocsec1 Registered Member Join Date: Jul 2012 Location: Medina oh Posts: 1,782	It has been my experience that the Neptune probe isn’t always accurate. I go by my Hanna and use the probe to,watch for changes in the reading.