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Water Testing Meter (TDS/EC Meter)
3-in-1 Versatility: A single device that toggles seamlessly between TDS (ppm), EC (S/cm), and Temperature (°C/°F).
Automatic Temperature Compensation (ATC): Features integrated ATC technology that automatically adjusts readings to account for temperature fluctuations, ensuring accuracy regardless of the liquid's thermal state.
₹246.00
Quick Answer: The Water Testing Meter (TDS/EC Meter) is a handheld instrument that measures the electrical conductivity (EC) of water and converts it into an estimate of total dissolved solids (TDS). A TDS meter is used to compare drinking, filtered and nutrient water quickly; it cannot show on its own that water is safe.
What a TDS/EC Reading Actually Measures
Dissolved salts split into ions, and ions let water carry an electric current. The meter applies a small alternating voltage between two electrodes and measures how easily current flows, which is the conductivity. Because it cannot tell which salts are present, it calculates TDS by multiplying the conductivity by a conversion factor, commonly somewhere between 0.5 and 0.7. Two meters using different factors can therefore show different TDS values for the same sample.
Conductivity rises by roughly two percent for every degree Celsius, so readings are normally referred to 25 °C. Many pen-type meters correct for this automatically; find out whether this model does, and let the probe reach the temperature of the sample before reading.
Just as important is what the meter cannot see. Sugars, most organic compounds, pesticides, bacteria and viruses add little or nothing to conductivity, so a low number does not mean water is fit to drink. Treat it as a quick screening and comparison tool: before and after an RO filter, across taps in a building, or while mixing hydroponic nutrient to a target strength. Schools logging conductivity over time can compare it with a wireless conductivity sensor.
Specifications
| Measures | Electrical conductivity (EC), displayed as EC or estimated TDS |
| Principle | Conductivity between electrodes, converted with a TDS factor |
| Temperature | Readings referred to 25 °C; automatic compensation on many models |
| Calibration | Against a conductivity standard solution |
| Range, resolution and TDS factor | Confirm at enquiry |
Applications
- Comparing RO and water-purifier output with the feed water
- Mixing and monitoring nutrient solutions in hydroponics and school agriculture projects
- Class investigations comparing tap, bottled, rain and distilled water
- Showing how conductivity rises as salt is added in chemistry lessons on ions
Care & Handling
- Rinse the electrodes in distilled or deionised water after each sample and shake them dry.
- Replace the cap after use to protect the electrodes, and never immerse the meter beyond its marked level.
- Calibrate regularly with fresh standard solution, never with solution poured back into its bottle.
- Keep to water samples near room temperature unless the manual allows otherwise.
Why Choose LabEquip
Schools running water-quality projects, hydroponics growers and technicians who service purifiers are the typical buyers. LabEquip lists this meter in the General Lab Products range; share your intended use on the contact page so the range can be matched.
Frequently Asked Questions
What is the difference between TDS and EC?
EC, electrical conductivity, is what the meter actually measures. TDS, total dissolved solids, is an estimate calculated from EC using a conversion factor. EC is therefore the more direct figure to record in experiments.
Does a low TDS reading mean water is safe to drink?
No. The meter responds only to ions. Bacteria, viruses, most organic chemicals and some toxic contaminants hardly change the reading, so safety has to be judged by proper microbiological and chemical testing.
How do I calibrate the meter?
Rinse the probe, dip it in fresh conductivity standard solution at the stated temperature, and adjust the reading to the value given for that standard, following the model’s instructions. Discard the used portion of standard afterwards.
Why do two meters show different TDS for the same water?
They may use different conversion factors, one may lack temperature compensation, or one may need calibration. Comparing their EC readings rather than TDS usually shows whether the meters actually agree.
Can it test sea water or strong salt solutions?
Only if the reading falls within the meter’s range; pen testers are usually set up for fresh water and may show an over-range sign in sea water. The range of the supplied model should be confirmed at enquiry.
Why is distilled water not zero on the meter?
Distilled water absorbs carbon dioxide from the air, which forms a little carbonic acid and some ions, so a small reading is normal. Readings near the bottom of a meter’s range are also less precise.
Last Updated: September 2026
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