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Old 08-03-2018, 02:05 PM   #1 (permalink)
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Default TDS meter

https://www.amazon.com/gp/product/B0...RXZIKJTQ&psc=1
this a good TDS meter?
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Old 08-03-2018, 07:21 PM   #2 (permalink)
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Default Re: TDS meter

They're all pretty much the same. Go for it.
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Old 08-03-2018, 07:40 PM   #3 (permalink)
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Default Re: TDS meter

I have same meter.
TDS is good, think conductivity is a calculated amount.
Temps take a few seconds to adjust.
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Old 08-04-2018, 05:17 AM   #4 (permalink)
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Default Re: TDS meter

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Originally Posted by Maryland Guppy View Post
I have same meter.
TDS is good, think conductivity is a calculated amount.
Temps take a few seconds to adjust.
It's actually the other way around. The meter measures electrical conductivity, and a fudge factor is used to convert conductivity to TDS. There is no direct measurement of TDS, which can only be determined in the lab by evaporating all water and weigh the solid left behind. The conversion to TDS is only rough approximation depending on what are the solutes. The fudge factor for seawater, for example, will be very different from hard fresh water dominated by Ca and Mg. Does your meter instruction say what is the default fudge factor, or there is an option to input your own.
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Old 08-04-2018, 05:35 AM   #5 (permalink)
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Default Re: TDS meter

The meter's TDS guess work is a bit more accurate these days when they include a thermometer into it. The conversion factor is affected by temperature so you see a lot of these TDS meters also include a thermometer.

Side note.
I use a duel stage carbon filter for my aquarium water mainly for dechlorinating. I just found out it also reduces the TDS by 40-50ppm.
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Old 08-04-2018, 06:15 AM   #6 (permalink)
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Default Re: TDS meter

Quote:
Originally Posted by Maryland Guppy View Post
I have same meter.
TDS is good, think conductivity is a calculated amount.
Temps take a few seconds to adjust.
ty
if you got it I trust it lol
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Old 08-04-2018, 07:02 AM   #7 (permalink)
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Default Re: TDS meter

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Originally Posted by mistergreen View Post
The meter's TDS guess work is a bit more accurate these days when they include a thermometer into it. The conversion factor is affected by temperature so you see a lot of these TDS meters also include a thermometer.

Side note.
I use a duel stage carbon filter for my aquarium water mainly for dechlorinating. I just found out it also reduces the TDS by 40-50ppm.
Itís not very accurate, even with temp adjustment. It depends on what are the sollutes. If it is largely organic, it can have very large tds, but little elevated conductivity.
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Old 08-04-2018, 07:11 AM   #8 (permalink)
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Default Re: TDS meter

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Originally Posted by tiger15 View Post
Itís not very accurate, even with temp adjustment. It depends on what are the sollutes. If it is largely organic, it can have very large tds, but little elevated conductivity.
eh I didnt need a 100% accurate TDS meter for 100$
just wanted a suggestion on what other people are using.
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Old 08-04-2018, 08:12 AM   #9 (permalink)
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Default Re: TDS meter

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eh I didnt need a 100% accurate TDS meter for 100$
just wanted a suggestion on what other people are using.
You canít get 100% accurate tds meter even if you spend $100,000, because it doesnít exist. The meter measures conductivity which is a proxy for tds. The one in the link appears to use a default fudge factor of 0.5, other brands use a different default factor.

I use this from eBay, cheaper with free shipping and a pH pen extra. It works essentially the same, except I canít even guess what fudge factor it defaults.

https://www.ebay.com/itm/Digital-LCD...72.m2749.l2649
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Old 08-04-2018, 08:59 AM   #10 (permalink)
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Default Re: TDS meter

Quote:
Originally Posted by tiger15 View Post
You canít get 100% accurate tds meter even if you spend $100,000, because it doesnít exist. The meter measures conductivity which is a proxy for tds. The one in the link appears to use a default fudge factor of 0.5, other brands use a different default factor.

I use this from eBay, cheaper with free shipping and a pH pen extra. It works essentially the same, except I canít even guess what fudge factor it defaults.

https://www.ebay.com/itm/Digital-LCD...72.m2749.l2649
was just a form of speech :-p
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