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Unfortunately, the cheaper instruments are mostly of no real use. The Hanna-instruments are good, but you must observe the storage (wet!) and the calibration. Otherwise you achieve wrong results. There are several good Hanna-pH-meters. One is a siple stick, another is a measuring unit which you put in the water connected by an electric cable to the indicating unit that tells you the result.
Hi Robert.
After I wasn’t satisfied with visual tests, and after Peter suggested Hanna, I got me this device: HI 9811-5.
As Peter wrote: Of course you have to calibrate, keep the measuring electrode wet etc. But I really like the feasibility to measure pH and TDS [mg/l] / conductivity [µS] with one device – and with a very high level of accuracy.
Regarding my HI 9811-5: I got it at a very fair rate at an German online store whose name I can’t remember now… But I will look it up at home and let you know.
Kind regards,
MichaelThanks Peter and Michael. I just took a look in the Internet for the PH Meter of Hanna. It would cost about 230€ Like you wrote Michael, It also measures TDS. I just want to search if there is another Company where a can buy it a bit cheaper. That’s what the Internet is good fore :-))
Best Regards
Robert
Hello Robert,
Important is the electrode. I use Greisinger GPH 014 with the electrode Greisinger GE 106. The GE 106 works still in water with low conductivity. The Greisinger GPH 014 looks like “from the last century” but it is good and cheap.
Greetings
Patrickmy “normal” Greisinger electrode did not work properly with a conductivity of 20 uS. Then I found in the book by HJ Krause “aquarium water” following trick: a little KCl-3 molar add to sample water.
A cross-check with an expensive WTW device / electrode then was only a difference of 0.1 PH. I think that’s ok.
Has anyone tried it too?Best regards
Arno
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