| Author |
Message |
    
Jim O'Conner (64.70.24.205)
| | Posted on Monday, January 12, 2004 - 08:31 pm: | 
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There are several in the $25 range sold by Proaquatica. Anyone here have one? |
Marlon Lang (68.218.229.99)
| | Posted on Tuesday, January 13, 2004 - 03:16 am: |
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I do this pH measure thing for a living, so just out of curiousity, I looked on e-bay at the Proaquatic units. For $27 (the meter with the calibration stuff, delivered), what have you got to lose? If it works, then you will be the hero of HBD. If it don't, then what the heck. Frankly, I suspect it will work, but not be the most repeatable measurement in the world. For this price, I doubt that it is temperature compensated. You will be forever tweaking the calibration adjustment or doing a manual temperautre compensation. But then, I like anchoivies, so what do I know? BTW, do you like Jimmy Reed? |
Chuck Denofrio (64.135.203.23)
| | Posted on Tuesday, January 13, 2004 - 03:33 am: |
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IHO, PH papers work great, are cheap and repeatable. |
Fredrik (213.114.44.219)
| | Posted on Tuesday, January 13, 2004 - 06:09 am: |
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I've got a cheap pH meter with single point calibration and no temp compensation. Mine is extremly sensitive, I recalibrate every single time, sometimes with many measurements I recalibrate several times in a day to be safe. I'd say it's a bit unstable, but it works and I think I'll get within +/-0.2 which I guess should be enough. If you want so save money on a cheap pH meter, think about that usually the calibration liquids are more expensive in the long run. I made my own cheap calibration liquid customized to pH 5.3, it just didn't make sense to me buying expensive calibration liquied to the cheapest possible pH meter. Without the calibration liquied the meter is absolutely uselsess.
I haven't tried the pH papers, but I figure if you don't want the calibration hassle, it may be the easy way.
/Fredrik |
Jim O'Conner (64.70.24.205)
| | Posted on Tuesday, January 13, 2004 - 10:16 am: |
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Marlon, I do like Jimmy Reed? Why do you ask?
Also, don't the probes have to be replaced? |
Sean Richens (142.161.106.49)
| | Posted on Sunday, January 25, 2004 - 12:41 am: |
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If you get a calibration solution right at the desired pH, the cheapest meter will be perfectly accurate. It's the probe that really determines performance, IMHO.
I use pH paper. That's right, actual paper pH strips. Dirt cheap, so I bought three narrow ranges overlapping at pH 5.3 and have essentially the same thing as the E.Merck $trip$. I do have years of experience going back to the days before digital meters etc., so I don't recommend this to everyone. |
Bill Pierce (24.141.129.137)
| | Posted on Sunday, January 25, 2004 - 08:42 pm: |
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Sean, in my experience the cheap pH papers aren't worth diddly. The plastic coated ColorpHast strips in the 4.0-7.0 range work well. |
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Brews and Views Archive 2004