PH meter

Homebrew Talk - Beer, Wine, Mead, & Cider Brewing Discussion Forum

Help Support Homebrew Talk - Beer, Wine, Mead, & Cider Brewing Discussion Forum:

Teufelhunde

Well-Known Member
Joined
Jan 4, 2020
Messages
510
Reaction score
445
So, I bought one of those cheap PH meters on Amazon.... PH Meter for Water Hydroponics Digital PH Tester Pen 0.01 High Accuracy Pocket Size with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium (Blue): Amazon.com: Industrial & Scientific and after FINALLY getting the thing to calibrate according to their crappy directions, it still reads around 6.75 or so (inconsistent) on my RO water. I know my RO system is in good shape, and all filters were changed less than six months ago.

Bottom line, I don't trust the thing AT ALL.

My question is this.....does anyone have any recommendations on a decent, reliable PH meter that is NOT in the $300 range? There has got to be something out there at a reasonable price....

TIA for any input....

Lon
 

RM-MN

Supporting Member
HBT Supporter
Joined
Nov 26, 2010
Messages
15,419
Reaction score
6,796
Location
Solway
Perhaps you are asking the wrong question? Perhaps the question you need to ask is, "do I really need a pH meter". I'd say that there are many more important tools to consider ahead of a pH meter.
 

dmtaylor

Lord Idiot the Lazy
HBT Supporter
Joined
Nov 8, 2009
Messages
5,695
Reaction score
5,174
Location
Two Rivers, WI
Put a splash of vinegar in your RO water. Then it should be able to land on a reading somewhat lower, maybe 5 or 6. Any pH meter will have a hard time reading pH when there's no electrolytes in the water. Measurement of pH of distilled water is basically impossible, and RO water is nearly as clean as distilled.
 

Henbrew

Supporting Member
HBT Supporter
Joined
Apr 18, 2017
Messages
192
Reaction score
284
Location
Macungie
As dmtaylor mentioned, you'll have a tough time getting a good reading in RO water, which is good because that means your RO system is working. Only way I'd test my meter is by using the standard calibration solutions.

This is the pH meter I use and it works great. I use it for brewing, my aquarium, and checking soil pH.

 

Jim R

Well-Known Member
Joined
Feb 21, 2020
Messages
384
Reaction score
390
Location
Wisconsin
I use this Milwaukee ph meter. It is very accurate with proper calibration and also has temperature control which is great when brewing for a little over $120.

 

jerrylotto

Well-Known Member
Joined
Apr 15, 2020
Messages
669
Reaction score
513
Location
North Chelmsford
Calibrate your pH probe with a standard solution such as pH 4.00 or pH 7.00, and compare the measurement to the standard value. For brewing (as opposed to scientific research), if the difference is within 0.05 pH, the meter is in good condition and a calibration is not a must at the point. If the difference is over 0.05 pH, then a recalibration is necessary and highly recommended. I also recommend storing the probe wet. I have a black cap on mine that I fill with saltwater before I put it away each time.
 

rhys333

Supporting Member
HBT Supporter
Joined
May 27, 2013
Messages
3,175
Reaction score
1,300
Location
Edmonton
Calibrate your pH probe with a standard solution such as pH 4.00 or pH 7.00, and compare the measurement to the standard value. For brewing (as opposed to scientific research), if the difference is within 0.05 pH, the meter is in good condition and a calibration is not a must at the point. If the difference is over 0.05 pH, then a recalibration is necessary and highly recommended. I also recommend storing the probe wet. I have a black cap on mine that I fill with saltwater before I put it away each time.

Is saltwater as good as storage solution? When I asked the seller of my 8689 about using anything else he just about stroked out.
 

jerrylotto

Well-Known Member
Joined
Apr 15, 2020
Messages
669
Reaction score
513
Location
North Chelmsford
I've always kept my pH probe submerged in 3.65% salt solution but recently I've read that it's not a good idea to keep the probe submerged all the time. I'm intending to research the topic a little more but I haven't gotten around to it yet.
 
Top