Coldbreak Brewing Giveaway - Open to All!

Home Brew Forums > Home Brewing Beer > Brew Science > Best PH Meter
Reply
 
Thread Tools
Old 12-22-2011, 04:54 PM   #1
cooper
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2009
Location: New Baden, IL
Posts: 371
Liked 10 Times on 8 Posts
Likes Given: 2

Default Best PH Meter

All,

I want to purchase a PH tester but there seems to be varying differences in testers on the market today. I've never used one before so I was wondering if you guys had one that you'd recommend for its useability and where to get it?

Thanks!


cooper is offline
 
Reply With Quote
Old 12-22-2011, 05:42 PM   #2
Homercidal
Licensed Sensual Massage Therapist.
HBT_MODERATOR.png
Feedback Score: 0 reviews
 
Homercidal's Avatar
Recipes 
 
Join Date: Feb 2008
Location: Reed City, MI
Posts: 26,614
Liked 3344 Times on 2284 Posts
Likes Given: 2108

Default

http://www.homebrewtalk.com/f128/loo...stions-207655/

http://www.homebrewtalk.com/f11/ph-m...ations-281770/


Homercidal is offline
 
Reply With Quote
Old 12-22-2011, 08:05 PM   #3
cooper
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2009
Location: New Baden, IL
Posts: 371
Liked 10 Times on 8 Posts
Likes Given: 2

Default

I've been looking at this one. What do you guys think?

http://www.amazon.com/gp/product/B00...=ATVPDKIKX0DER

This one too:

http://www.milwaukeetesters.com/MW102.html
cooper is offline
 
Reply With Quote
Old 12-22-2011, 09:16 PM   #4
smakudwn
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
smakudwn's Avatar
Recipes 
 
Join Date: Mar 2009
Location: St.Charles, MO
Posts: 1,068
Liked 58 Times on 42 Posts
Likes Given: 8

Default

I have used that meter before, and it seems to work pretty well. I have only used it 2 times.
smakudwn is offline
 
Reply With Quote
Old 12-22-2011, 10:16 PM   #5
ajdelange
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2010
Location: McLean/Ogden, Virginia/Quebec
Posts: 7,591
Liked 993 Times on 789 Posts
Likes Given: 28

Default

The MW102 looks pretty good at the price. Note that spec accuracy is 0.02 pH according to the data sheet and not the 0.01 listed on the website referenced in #3 (given that the thing apparently only resolves 1 mV which is 0.005 pH it would be hard pressed to come up with an accuracy of 0.01). Using standard buffers you aren't going to get accuracy of better than 0.02 anyway but that is accurate enough for brewing.

One of the nicest features in this meter is the stability determination capability i.e. as long as the reading is changing the indicator blinks to show you that it is not stable. In many meters you can adjust the stability threshold i.e. specify that the reading must not change by more than x mV in y seconds for the meter to declare the reading valid. This is a very nice feature (though a PITA if you are doing titrations) but can sometimes lead one astray. I always note the reading as soon as the meter declares it stable but then wait another minute or so and then initiate another reading. The electrode will continue to move towards equilibrium in the time between the readings and if the second is awfully close to the first you should wait even longer and then repeat a third time.

If you watched the calibration video on the link in #3 I'd advise doing things somewhat differently. First, you should rinse with DI water from a squirt bottle. Don't rinse the probe repeatedly in the same water and don't use tap water for rinsing. Second, after each rinse shake and preferrably blot the rinse water away from the electrode using a paper towel or something like. Don't touch the bulb directly with the paper towel - its sufficient to get the water off the electrode housing. Third, prepare fresh buffer, open a new packet each calibration or, if you have purchased bulk premade buffer, pour out a fresh bit for each calibration. Don't stick the electrode and RTD in the bottle and then do the same thing next time. Obviously the concern here is contamination and dilution. Even though you have, presumably, rinsed off most of buffer and sample and have done a good job shaking/blotting you haven't gotten rid of 100%.


ajdelange is offline
 
Reply With Quote
Reply


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Using a pH meter nilo Brew Science 9 06-07-2011 12:14 AM
Proper use of a pH meter EvilBrewer Brew Science 18 12-21-2010 07:01 PM
Drifting Ph Meter hedonist91 Brew Science 7 10-14-2010 04:32 PM
pH Meter Suggestions? winvarin Brew Science 16 10-02-2010 03:18 PM


Forum Jump

Newest Threads

LATEST SPONSOR DEALS