TDS Pen recommendations? - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 02-23-2020, 07:27 PM Thread Starter
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Question TDS Pen recommendations?

Hi all,

I recently got a HM TDS EZ pen and I hate it. It doesnít calibrate for temp, for one thing, and the readings are all over the place.

Iíd really like to find one that is simple to use and still very accurate? Does such a beast exist?

Many thanks!
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post #2 of 4 (permalink) Old 02-24-2020, 04:08 PM
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My favorite variety are the cheap blue ones from fleabay. Usually around the US$10 point. If you slightly calibrate them or at least regularly measure known TDS solutions and can see where things stand, they should work pretty well for you.

I've had a couple of them for more than a decade.

But about the HM... is it genuine or counterfeit? It should be pretty reliable. Though, accounting for temperatures in the 70-80F range shouldn't cause much concern for the average hobbyist. If readings are truly all over the place, you should contact them to ask for a replacement.


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post #3 of 4 (permalink) Old 02-24-2020, 05:15 PM
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I use the HM TDS-3 and it works pretty well for me. Does exactly what I need it to. I wonder as well if you got a genuine HM as I have mostly heard that they were pretty good hobbyist TDS meters.
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post #4 of 4 (permalink) Old 02-24-2020, 08:15 PM
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I've had the HM TDS-EZ for many years, gives reliable and consistent readings: TDS-EZ ? HM Digital
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