TDS Meter Accuracy

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twitcher

 
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TDS Meter Accuracy

by twitcher » Thu Sep 27, 2018 3:29 am

Has anybody compared two or more TDS meters to get a feel for how accurate and reliable they are? I rely on mine a lot to assure good water quality, but only have one meter. I'm talking about using two different meters to compare the same water sample and seeing how much they agree.
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Shadowtski
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Re: TDS Meter Accuracy

by Shadowtski » Thu Sep 27, 2018 6:52 am

Are there any growers or forum members with a tds meter in your vicinity?
Put out a call.
If there is, you can get together and compare tds numbers.

Another thoughf......
There is a thread in this subforum about the tds in various municipal areas. There were quite a few listed. Check and see if your local city is in the listings.

Good growing,
Mike

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riveraXVX

 
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Re: TDS Meter Accuracy

by riveraXVX » Thu Sep 27, 2018 1:38 pm

you can mix up a solution (or buy one premixed) of water to calibrate even most cheap meters, you will know the accuracy via the solution if the meter is not accurate it won't match up

i found this link quickly via google to help out, I didn't read it over thoroughly but shows the mixtures you can make (its just table salt/water more or less anyway!)

http://www.xtremesystems.org/forums/sho ... asurements

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Re: TDS Meter Accuracy

by Fieldofscreams » Thu Sep 27, 2018 5:08 pm

They are so cheap just buy a couple.
Mistakes were made

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cryostasis

 
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Re: TDS Meter Accuracy

by cryostasis » Sat Oct 13, 2018 3:16 am

I have two TDS meter I always get different results they are sometimes 5-10 point different. Mostly rely on the white one but might get the xiaomi as they said it gives a more accurate result only cost $4. These two costs around $2 here in the Philippines if you find a good seller.ImageImage

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AnitaB

 
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Re: TDS Meter Accuracy

by AnitaB » Sat Dec 08, 2018 2:46 pm

I've used BlueLab pen for 4 year with no problems. And its water proof. highly recommend.

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Fishkeeper

 
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Re: TDS Meter Accuracy

by Fishkeeper » Tue Mar 05, 2019 3:39 pm

You really only need a reading that's within 5-10 points anyway, at least for CP purposes. 10ppm water and 20ppm water are both fine.

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twitcher

 
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Re: TDS Meter Accuracy

by twitcher » Wed Mar 06, 2019 8:01 am

I ended up second sourcing, ending up with 4 different meters. I gave one away to a cp newbee. The other 3 meters all agree with a high degree of accuracy when measuring water at the low end of the TDS scale. I'll be checking them against the same water samples at higher tds levels as opportunity presents.
The larger the island of knowledge, the longer the shoreline of wonder.

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