Is Milwaukee pH Probe Junk?

scottydo · 03/14/2008, 03:36 PM

I am new to pH probes - got a Milwaukee one 6 weeks ago for my AcJr, calibrated it, and have not touched it since then. I pulled it out to re-calibrate yesterday and found it had shifted by .4.
Should I be calibrating or cleaning the probe more often or is a .4 shift in 6 weeks normal? Or is a Milwaukee probe just not up to par?

bertoni · 03/14/2008, 03:52 PM

You might try cleaning it to see how much the shift is reduced, but that result seems within reason.

Randy Holmes-Farley · 03/14/2008, 04:48 PM

What was the probe tip stored in during that time?

scottydo · 03/14/2008, 06:15 PM

Quote:

Originally posted by Randy Holmes-Farley
What was the probe tip stored in during that time?

Oh, it's been in the tank in the sump area in the back during that time.

Billybeau1 · 03/15/2008, 12:06 AM

I expect that was a one time correction. I'd be surprised if it was off that much again.

Keep us posted.

scottydo · 03/15/2008, 10:25 PM

Quote:

Originally posted by Billybeau1
I expect that was a one time correction. I'd be surprised if it was off that much again.

Keep us posted.

I hope so - I pulled it out of the tank again last night, soaked it in a Vinegar/RO solution for 10 minutes and then scrubbed it gently with a toothbrush - put it back in the tank and it read exactly the same as when I took it out. For giggles I calibrated it again, still reading the same when I put it back in the tank.
I'll check it again in a few weeks and see what I get.

Billybeau1 · 03/15/2008, 11:29 PM

03/14/2008, 03:36 PM	#1
scottydo Registered Member Join Date: Sep 2007 Location: Idaho Posts: 127	Is Milwaukee pH Probe Junk? I am new to pH probes - got a Milwaukee one 6 weeks ago for my AcJr, calibrated it, and have not touched it since then. I pulled it out to re-calibrate yesterday and found it had shifted by .4. Should I be calibrating or cleaning the probe more often or is a .4 shift in 6 weeks normal? Or is a Milwaukee probe just not up to par?

03/14/2008, 03:52 PM	#2
bertoni RC Mod Join Date: Mar 2002 Location: Mountain View, CA, USA Posts: 88,616	You might try cleaning it to see how much the shift is reduced, but that result seems within reason. __________________ Jonathan Bertoni

03/14/2008, 04:48 PM	#3
Randy Holmes-Farley Reef Chemist Join Date: Apr 2001 Location: Arlington, Massachusetts Posts: 86,233	What was the probe tip stored in during that time? __________________ Randy Holmes-Farley Current Tank Info: 120 mixed reef

03/15/2008, 12:06 AM	#5
Billybeau1 Registered Member Join Date: Jul 2005 Location: Dyer, Indiana Posts: 12,010	I expect that was a one time correction. I'd be surprised if it was off that much again. Keep us posted.

03/15/2008, 11:29 PM	#7
Billybeau1 Registered Member Join Date: Jul 2005 Location: Dyer, Indiana Posts: 12,010