jpsmith123
National Hazard
Posts: 764
Registered: 24-6-2005
Member Is Offline
Mood: No Mood
|
|
Question About Cheap Digital pH Meters
Does anyone know how well the cheap ebay variety of digital pH meters work for testing chlorate and perchlorate solutions? Thanks.
Regards,
Joe
|
|
|
DrP
National Hazard
Posts: 625
Registered: 28-9-2005
Member Is Offline
Mood: exothermic
|
|
I was given some cheap plastic pH meters. First I was pleased the freebies, however, I found I had to re-calibrate them before nearly every reading.
I'd calibrate, get a reading and then 5 mins later the things had drifted way off.
I have heard good report about some cheap meters being stable, but not in my experience, so i think it would be pot luck. We paid about £140.00 for
ours at work a couple of years ago and it is still really solid. (needs re-calibrating every year or so).
I guess it depends on your requirements - if it is going to get industrial levels of use and the results are for quality controll or something where
you really do not want a spurious reading, then get a decent one. If you only want to test occassionally then you might be ok with a
cheapie. Suck it and see.
|
|
|
lordmagnus
Hazard to Self
Posts: 92
Registered: 10-1-2006
Location: Webster, TX
Member Is Offline
Mood: No longer annoyed ( I found a new girlfriend)
|
|
I bought a HANNA instruments CHECKER model, it works well for my lab, and my aquarium. After about a dozen test over a two day period,I rinsed the tip
with distilled water, shook dry, and placed in the 7.01 PH buffer solution, and it had drifted more alkaline, so I adj. the 7.0 set screw on top, back
till it gave a steady read of 7.01-7.02 and all is well again, for the $30 I payed, it is a great little instrument. I also use it to check the life
remaining in my citric acid stop bath for my black and white photography.
I\'ll kill a man in a fair fight, or if I think he is gonna start a fair fight, or if he\'s bothrn me allot, or if I am getin payed good, or probably
over a good woman.
-Jayne Cobb (Serenity) |
|
|
dedalus
Hazard to Self
Posts: 60
Registered: 13-4-2007
Location: New York
Member Is Offline
Mood: No Mood
|
|
| Quote: | Originally posted by lordmagnus
I bought a HANNA instruments CHECKER model, it works well for my lab, and my aquarium. After about a dozen test over a two day period,I rinsed the tip
with distilled water, shook dry, and placed in the 7.01 PH buffer solution, and it had drifted more alkaline, so I adj. the 7.0 set screw on top, back
till it gave a steady read of 7.01-7.02 and all is well again, for the $30 I payed, it is a great little instrument. I also use it to check the life
remaining in my citric acid stop bath for my black and white photography. |
Enthusiastic second!
That Checkr is one of the best values around.
|
|
|
Texium
|
Thread Moved
19-11-2023 at 12:01 |
![[*]](images/xpblue/default_icon.gif){kind=icon}
