Handheld TDS testing meters

[roadrashpaul]

Anyone using these cheap TDS meters on Amazon?

LCD Digital TDS Meter Tester Water Quality Ppm Purity Filter with Battery - Amazon.com

HM Digital TDS-EZ Water Quality TDS Tester, 0-9990 ppm Measurement Range, 1 ppm Resolution, +/- 3% Readout Accuracy - Amazon.com

HM Digital TDS-4 Pocket Size TDS Tester Meter Without Digital Thermometer, 0-9990 ppm Measurement Range, 1 ppm Resolution, +/- 2% Readout Accuracy - Amazon.com

 

[Mufasa31]

I have the 1st one. It works fine.

I now use a dual inline meter.

 

[roadrashpaul]

Did you have to calibrate it?

 

[Mufasa31]

It was pre-calibrated.

I bought mine from AquaFX.

 

[roadrashpaul]

Great, Thanks.

 

[mcarroll]

Nice to have a handheld in addition to in-line monitoring, IMO. Good for flexibility in testing any water sample and for verifying in-line results. I do have in-line monitoring for the water IN and OUT of the DI stage. Don't yet have a handheld - would like one.

-Matt

 

[AZDesertRat]

Go with a HM Digital TDS-3, TDS-4TM or AP-1. All are +/-2%, auto temperature compensated and have a built in digital thermometer too. The ones you listed are not the same sensitivity r accuracy.
Handhelds are by far better than inlines since they are temperature compensated and the inlines are not since the temp probe senses air temperaure and is not wetted. They also lack the portability so you are stuck with two points when you need three readings to monitor a RO/DI system, tap, RO nly and final RO/DI.

 

[Mike J.]

I read this thread because I wanted to see what AZDesertRat would write. Always good and reliable information.