Milwaukee PH Controller Problems

[anjhof]

I have had a Milwaukee PH Controller for about a year. I never used the calibration fluid, but I just figured the reading was off a full point as the water in my tank was around 7.1 all the time. I finally decided to try to calibrate this thing and I can't get it even close. When I put it in the 7.0 solution I am around 5.2 - 5.5. When I put it in the 10.0 solution it only goes to around 6.0-6.2. I tried using the adjuster in the back and it only moves it about .3.
Is this thing broken or am I doing something wrong?

 

[-=Efrain=-]

Is the probe clean.. If not clean it then try.

 

[anjhof]

It looks very clean. I also just washed it off and the readings are still way off. Does it matter where I have the dial set when it comes to calibrating it - 5.5- 9.5?

 

[SlowCobra]

Probes typically need to be replaced between 6-12 months.

 

[prugs]

If your Milwaukee PH Controller is like mine.
The screw on the back is for adjusting 4.0 PH
The small white screw on the front is for adjusting 7.0 PH

 

[anjhof]

Ok, so I am an idiot. I forgot about the screw on the front. Of course, when I adjust that, I can get it to 7.0, but I can't get it up to 10.0 when I dip the probe in the 10.0 solution.
Who sells replacement probes?

 

[prugs]

What model controller do you have?
My meter instructions only call for 4.0 & 7.0 PH calibration.

 

[SlowCobra]

You can NOT calibrate a PH meter with 7 and 10. You need 4 and 7.

 

[anjhof]

I am using the Milwaukee SMS 122 Controller.
Well that makes a lot more sense! Thanks guys!