APEC TDSMETER Digital Water Quality TDS Tester Meter with Carrying Case, 0 to 1999 ppm Measurement Range, 1 ppm Resolution, +/- 2% Readout Accuracy

This is a great reverse osmosis system. We have a well and it took my dissolved solids down from 323 to 22. It was easy to install, took a little over an hour, and really improved the taste of our coffee and ice cubes. We feel much safer drinking out water now.

It was great to get the tester because it showed me that I did not have to change the filters so soon.

This is a quick easy way to find out what your tds level is of the water coming into your house, then compare it to water coming out of my APEC RO system.

I needed an inexpensive water tester for my RO unit. This does the job I needed it to do.

You must get one of these if you have a water system to test your water to know when to replace the filters.

A great tool to help determine when it's time to change the filters in your Essence 5-stage 50 GPD RO Drinking Water System.

It seems to work fine! Not really sure what else i can say about it

It appears to work very well. So far so good happy with this purchase

Not very clear what the reading means when you get it. The instructions don't tell you much about what the reading means.

The water filter cartridge itself is just like always — it works well and I have no complaints about the filtration quality. I've used this type before and it performs as expected. However, the included TDS tester is very low quality. The battery does not stay in place and keeps popping out, which makes the tester unreliable and frustrating to use. Because of this issue, I can't properly trust the readings. Overall, the filter cartridge is good, but the TDS tester needs better build quality.