Reliable TDS Meter?

The Rook · Sep 3, 2016

Can't seem to get repeatable results from my $15-$20 HM Digital EZ Meter (purple one). Even when using calibration fluid.

Is there a decent one thats not too expensive?

cromag27 · Sep 3, 2016

I use the hm digital com-100.

The Rook · Sep 3, 2016

Thanks. I'll give that one a shot.

AZDesertRat · Sep 4, 2016

The EZ is their bottom end meter and not ATC compensated. Look at the TDS-3, TDS-4TM or AP-1 as their best basic meters and the COM-100 as their best. I have owned all of them and currently use the COM-100 with an AP-1 as a back up.

The Rook · Sep 5, 2016

Excellent info. Thanks. Just ordered the AP-1. Hopefully that one will work better.

revhtree · Dec 22, 2016

AZDesertRat said:
The EZ is their bottom end meter and not ATC compensated. Look at the TDS-3, TDS-4TM or AP-1 as their best basic meters and the COM-100 as their best. I have owned all of them and currently use the COM-100 with an AP-1 as a back up.

What do you think about inline meters?

cromag27 · Dec 22, 2016

Inline meters are not very accurate. a high quality handheld is preferred any day of the week, over an inline. however, inlines are useful if you're comparing numbers to each other, with as figuring out a membrane's rejection rate.

I have dual inline meters on my spectrapure rodi and I still test with a handheld.

revhtree said:
What do you think about inline meters?

Cflip · May 7, 2017

I just received the ap-1 and bought the calibration fluid. It says do not calibrate when you first receive it it's already been set yet it's reading 359 for my 342 test solution. Should I calibrate or not?