TDS Meter Accuracy

TDS Meter Accuracy#322954

By twitcher -  Thu Sep 27, 2018 2:29 am
Posts:  656
Joined:  Sat Aug 25, 2018 5:56 am

- Thu Sep 27, 2018 2:29 am #322954

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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Re: TDS Meter Accuracy#322955

By Shadowtski -  Thu Sep 27, 2018 5:52 am
Location:  Zone 6A - SE. Wisconsin
Posts:  4723
Joined:  Tue Mar 22, 2016 8:19 am

- Thu Sep 27, 2018 5:52 am #322955

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.

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Re: TDS Meter Accuracy#322962

By riveraXVX -  Thu Sep 27, 2018 12:38 pm
Posts:  1099
Joined:  Sat Apr 29, 2017 5:29 am

- Thu Sep 27, 2018 12:38 pm #322962

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

Re: TDS Meter Accuracy#322966

By Fieldofscreams -  Thu Sep 27, 2018 4:08 pm
Posts:  1315
Joined:  Wed Sep 06, 2017 11:14 am

- Thu Sep 27, 2018 4:08 pm #322966

They are so cheap just buy a couple.

Mistakes were made

Re: TDS Meter Accuracy#323810

By cryostasis -  Sat Oct 13, 2018 2:16 am
Posts:  122
Joined:  Fri Jul 13, 2018 10:53 am

- Sat Oct 13, 2018 2:16 am #323810

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.

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Re: TDS Meter Accuracy#326252

By AnitaB -  Sat Dec 08, 2018 2:46 pm
Posts:  49
Joined:  Sun Apr 10, 2016 4:41 pm

- Sat Dec 08, 2018 2:46 pm #326252

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

Re: TDS Meter Accuracy#330155

By Fishkeeper -  Tue Mar 05, 2019 3:39 pm
Posts:  793
Joined:  Sat Dec 03, 2016 10:59 pm

- Tue Mar 05, 2019 3:39 pm #330155

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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Re: TDS Meter Accuracy#330194

By twitcher -  Wed Mar 06, 2019 8:01 am
Posts:  656
Joined:  Sat Aug 25, 2018 5:56 am

- Wed Mar 06, 2019 8:01 am #330194

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.

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