

The TDS in-line meter D&D accurately measures the amount of dissolved solids in the water in your reverse osmosis unit. Thanks to its two probes and microprocessor technology, it allows you to check the quality of your reverse osmosis water at a glance, to ensure perfectly pure and residue-free water.
The D&Donline TDS meter is the essential tool for any aquarist wishing to monitor the quality of the water produced by his osmosis unit. This device measures the amount of total dissolved solids (TDS) in a solution, a direct indicator of water purity. The lower the TDS, the purer your water: a value between 0 and 10 ppm indicates perfect osmosis.
Dissolved solids such as mineral salts increase the electrical conductivity of water. The TDS meter D&D measures this conductivity, converts it into a TDS (Total Dissolved Solids) value, and displays the result in ppm. Thus, it allows you to quickly determine if your reverse osmosis membrane is working properly or needs replacement.
| Feature | Detail |
|---|---|
| Mark | D&D |
| Model | TDS meter online |
| Measuring range | 0 to 9990 ppm (1 ppm / 10 ppm resolution depending on range) |
| Precision | ± 2% |
| Feeding | 2 x 1.5V button batteries (included) |
| Autonomy | Approximately 1000 hours of continuous use |
| Auto-Off Function | Automatic switch-off after 10 minutes |
| Cable length | 24.5" (with sensors) |
| Size | 7.6 × 2 × 4.7 cm |
| Weight | 79.4 g |
| Accessories | Raccords rapides John Guest Quick Connect T |
Recif'Art advice: place one probe before and another after your reverse osmosis membrane to compare the quality of the inlet and outlet water. This will immediately tell you if your reverse osmosis unit is working optimally.
⚠️ Use only for aquarium or home applications. Do not immerse the main unit in water.
A TDS meter measures the amount of total dissolved solids (TDS) in water. It allows you to check the purity of the water produced by an osmosis unit and to check the condition of the membranes and filters in your system.
Good quality reverse osmosis water has a TDS between 0 and 10 ppm. The lower the value, the purer the water. Tap water can have values between 20 and 300 ppm depending on the region.
The device measures the conductivity of water using its electrodes, then converts this data into a TDS value expressed in ppm. It is equipped with two probes to simultaneously measure the inlet and outlet water of the reverse osmosis unit.
The first reading (IN) corresponds to tap water, while the second (OUT) corresponds to reverse osmosis water. A big difference between the two indicates an effective osmosis unit. If the output value increases, it means that the filters or the membrane need to be replaced.
Yes, it offers an accuracy of ±2% thanks to its microprocessor technology and sensors calibrated to 342 ppm NaCl. It can be recalibrated easily using a mini screwdriver to maintain reliable measurements.
The TDS D&D meter comes with John Guest quick couplings for quick and easy installation on the waterline. It runs on batteries and automatically shuts off after 10 minutes of inactivity to save battery life.





Fiable et efficace

The TDS in-line meter D&D accurately measures the amount of dissolved solids in the water in your reverse osmosis unit. Thanks to its two probes and microprocessor technology, it allows you to check the quality of your reverse osmosis water at a glance, to ensure perfectly pure and residue-free water.











Tds
Fonctionne correctement.