TDS Meter for Checking Dissolved Solids in Water
This handheld TDS meter displays total dissolved solids in ppm and conductivity in µS/cm, together with water temperature. It is useful for checking a nutrient solution, comparing source water and observing changes between reservoir top-ups.
Listed Measurement Specifications
| Measurement | Listed range |
|---|---|
| TDS | 0-9990 ppm |
| Conductivity | 0-9999 µS/cm |
| Temperature | 0-60°C / 32-140°F |
| Listed error | ±2% |
| Battery | 3V CR2032 |
The meter measures dissolved ionic content; it does not identify individual nutrients and it does not replace a pH meter. Use both measurements when managing a hydroponic reservoir.
How to Use the TDS Meter
- Remove the cap and rinse the probe with clean water.
- Place the probe into the sample without submerging the display housing.
- Stir gently and wait for the reading to stabilise.
- Use the shift control to view the required unit.
- Hold the reading if needed, then rinse and dry the probe before storage.
Always measure samples at a consistent stage. Comparing the same reservoir before and after adding nutrients is more useful than comparing readings taken under different conditions.
What TDS Can and Cannot Tell You
- A higher ppm reading means more dissolved material, not automatically a better nutrient balance.
- Source-water minerals contribute to the reading before nutrients are added.
- Plant uptake and water evaporation can move the number in different directions.
- Crop targets depend on the nutrient programme and growth stage.
Record readings rather than chasing a single generic number. If the result looks unusual, retest the sample and compare it with a known solution before changing the reservoir.
Complete a Water-Testing Kit
Pair the meter with a hydroponic pH meter or compare the combined pH, EC and TDS meter. Browse our hydroponics range for dosing and reservoir accessories.
TDS Meter FAQ
Does a TDS meter measure pH?
No. TDS and pH are separate measurements. Use a dedicated pH meter when checking acidity or alkalinity.
What is the difference between ppm and µS/cm?
µS/cm is a conductivity reading. Ppm is a converted estimate of dissolved solids, so conversion scales can vary between meters.
Should the meter be calibrated?
Check it periodically against a suitable reference solution and follow the supplied instructions for any adjustment procedure.
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