Review on ROOYLE Backlight PPM Measurement Temperature Aquariums: Advanced Aquatic Monitoring Solution by Billy Braggs

We had two other types of TDS ppm units and they seemed far off when I tested them. This is the best of the three. It came close to true ppm. I have a colloidal silver product that has a specific ppm concentration, so I used it to test the accuracy of this meter. The meter is absolutely simple to use and its readings are easy to read. I actually got this for a TDS device and haven't tried the PH meter. All I needed was an accurate TDS meter and the PH meter is a nice bonus. I am very happy with the set.